Merge branch 'stable-3.1' into stable-3.2

* stable-3.1:
  Fix test due to change in Gerrit core
  ChecksSubmitRule.Module: Demote base class to AbstractModule

Change-Id: Id9c2833b75419c9fecc430636b0258a235ea9bb9
diff --git a/.eslintrc.json b/.eslintrc.json
new file mode 100644
index 0000000..affb7c4
--- /dev/null
+++ b/.eslintrc.json
@@ -0,0 +1,167 @@
+{
+  "extends": ["eslint:recommended", "google"],
+  "parserOptions": {
+    "ecmaVersion": 8,
+    "sourceType": "module"
+  },
+  "env": {
+    "browser": true,
+    "es6": true
+  },
+  "globals": {
+    "__dirname": false,
+    "app": false,
+    "page": false,
+    "Polymer": false,
+    "process": false,
+    "require": false,
+    "Gerrit": false,
+    "Promise": false,
+    "assert": false,
+    "test": false,
+    "flushAsynchronousOperations": false
+  },
+  "rules": {
+    "arrow-parens": ["error", "as-needed"],
+    "block-spacing": ["error", "always"],
+    "brace-style": ["error", "1tbs", { "allowSingleLine": true }],
+    "camelcase": "off",
+    "comma-dangle": ["error", {
+      "arrays": "always-multiline",
+      "objects": "always-multiline",
+      "imports": "always-multiline",
+      "exports": "always-multiline",
+      "functions": "never"
+    }],
+    "eol-last": "off",
+    "indent": ["error", 2, {
+      "MemberExpression": 2,
+      "FunctionDeclaration": {"body": 1, "parameters": 2},
+      "FunctionExpression": {"body": 1, "parameters": 2},
+      "CallExpression": {"arguments": 2 },
+      "ArrayExpression": 1,
+      "ObjectExpression": 1,
+      "SwitchCase": 1
+    }],
+    "keyword-spacing": ["error", { "after": true, "before": true }],
+    "lines-between-class-members": ["error", "always"],
+    "max-len": [
+      "error",
+      80,
+      2,
+      {
+        "ignoreComments": true,
+        "ignorePattern": "^import .*;$"
+      }
+    ],
+    "new-cap": ["error", { "capIsNewExceptions": ["Polymer", "LegacyElementMixin", "GestureEventListeners", "LegacyDataMixin"] }],
+    "no-console": "off",
+    "no-multiple-empty-lines": [ "error", { "max": 1 } ],
+    "no-prototype-builtins": "off",
+    "no-redeclare": "off",
+    "no-restricted-syntax": [
+      "error",
+      {
+        "selector": "ExpressionStatement > CallExpression > MemberExpression[object.name='test'][property.name='only']",
+        "message": "Remove test.only."
+      },
+      {
+        "selector": "ExpressionStatement > CallExpression > MemberExpression[object.name='suite'][property.name='only']",
+        "message": "Remove suite.only."
+      }
+    ],
+    "no-undef": "off",
+    "no-useless-escape": "off",
+    "no-var": "error",
+    "object-shorthand": ["error", "always"],
+    "padding-line-between-statements": [
+      "error",
+      {
+        "blankLine": "always",
+        "prev": "class",
+        "next": "*"
+      },
+      {
+        "blankLine": "always",
+        "prev": "*",
+        "next": "class"
+      }
+    ],
+    "prefer-arrow-callback": "error",
+    "prefer-const": "error",
+    "prefer-spread": "error",
+    "quote-props": ["error", "consistent-as-needed"],
+    "require-jsdoc": "off",
+    "semi": [2, "always"],
+    "template-curly-spacing": "error",
+    "valid-jsdoc": "off",
+
+    "require-jsdoc": 0,
+    "valid-jsdoc": 0,
+    "jsdoc/check-alignment": 2,
+    "jsdoc/check-examples": 0,
+    "jsdoc/check-indentation": 0,
+    "jsdoc/check-param-names": 0,
+    "jsdoc/check-syntax": 0,
+    "jsdoc/check-tag-names": 0,
+    "jsdoc/check-types": 0,
+    "jsdoc/implements-on-classes": 2,
+    "jsdoc/match-description": 0,
+    "jsdoc/newline-after-description": 2,
+    "jsdoc/no-types": 0,
+    "jsdoc/no-undefined-types": 0,
+    "jsdoc/require-description": 0,
+    "jsdoc/require-description-complete-sentence": 0,
+    "jsdoc/require-example": 0,
+    "jsdoc/require-hyphen-before-param-description": 0,
+    "jsdoc/require-jsdoc": 0,
+    "jsdoc/require-param": 0,
+    "jsdoc/require-param-description": 0,
+    "jsdoc/require-param-name": 2,
+    "jsdoc/require-param-type": 2,
+    "jsdoc/require-returns": 0,
+    "jsdoc/require-returns-check": 0,
+    "jsdoc/require-returns-description": 0,
+    "jsdoc/require-returns-type": 2,
+    "jsdoc/valid-types": 2,
+    "jsdoc/require-file-overview": ["error", {
+      "tags": {
+        "license": {
+          "mustExist": true,
+          "preventDuplicates": true
+        }
+      }
+    }],
+    "import/named": 2,
+    "import/no-unresolved": 2,
+    "import/no-self-import": 2,
+    // The no-cycle rule is slow, because it doesn't cache dependencies.
+    // Disable it.
+    "import/no-cycle": 0,
+    "import/no-useless-path-segments": 2,
+    "import/no-unused-modules": 2,
+    "import/no-default-export": 2
+  },
+  "plugins": [
+    "html",
+    "jsdoc",
+    "import"
+  ],
+  "settings": {
+    "html/report-bad-indent": "error"
+  },
+  "overrides": [
+    {
+      "files": ["*_html.js", "*-styles.js"],
+      "rules": {
+        "max-len": "off"
+      }
+    },
+    {
+      "files": ["*.html"],
+      "rules": {
+        "jsdoc/require-file-overview": "off"
+      }
+    }
+  ]
+}
diff --git a/.gitignore b/.gitignore
index 24636d6..939ad29 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 bower_components
 .vscode
-web-component-tester
\ No newline at end of file
+web-component-tester
+node_modules
diff --git a/README.md b/README.md
index 4a61e1e..638a6a9 100644
--- a/README.md
+++ b/README.md
@@ -3,8 +3,26 @@
 This plugin provides a unified experience for checkers (CI systems, static
 analyzers, etc.) to integrate with Gerrit Code Review.
 
-This plugin uses [polymer-cli](https://www.polymer-project.org/1.0/docs/tools/polymer-cli#install) to test.
+When upgrading the plugin, please use init:
 
-After `bower install`, running `polymer test -l chrome` will run all tests in Chrome, and running `polymer serve`
-and navigating to http://127.0.0.1:8081/components/checks/gr-checks/gr-checks-view_test.html allows for manual debugging.
+    java -jar gerrit.war init -d site_path
 
+More details about "init" in https://gerrit-review.googlesource.com/Documentation/pgm-init.html
+
+## UI tests
+
+To run UI tests here will need install dependencies from both npm and bower.
+
+`npm run wct-test` should take care both for you, read more in `package.json`.
+
+You will need `polymer-bridges` which is a submodule you can clone from: https://gerrit-review.googlesource.com/admin/repos/polymer-bridges
+
+## Test plugin on Gerrit
+
+1. Build the bundle locally with: `bazel build gr-checks:gr-checks`
+2. Serve your generated 'checks.js' somewhere, you can put it under `gerrit/plugins/checks/` folder and it will automatically served at `http://localhost:8081/plugins_/checks/` (no need to pass it to --plugins flag)
+3. Use FE dev helper, https://gerrit.googlesource.com/gerrit-fe-dev-helper/, inject the local served 'checks.js' to the page
+
+If your plugin is already enabled, then you can block it and then inject the compiled local verison.
+
+See more about how to use dev helper extension to help you test here: https://gerrit.googlesource.com/gerrit-fe-dev-helper/+/master
\ No newline at end of file
diff --git a/bower.json b/bower.json
index 69b6458..cdd854e 100644
--- a/bower.json
+++ b/bower.json
@@ -1,20 +1,11 @@
 {
   "name": "checks",
-  "authors": [
-    "dhruvsri@google.com"
-  ],
   "license": "http://www.apache.org/licenses/LICENSE-2.0",
-  "dependencies": {
-    "polymer": "Polymer/polymer#^1.0.0",
-    "webcomponentsjs": "webcomponents/webcomponentsjs#^0.7.0",
-    "codemirror-minified": "^5.37.0",
-    "chai": "^4.0.0"
-  },
   "devDependencies": {
-    "web-component-tester": "Polymer/web-component-tester#^6.0.0",
-    "iron-test-helpers": "^2.0.0",
-    "chai": "^4.0.0",
-    "moment": "^2.24.0"
+    "es6-promise": "^3.3.1",
+    "chai": "^4.2.0",
+    "mocha": "^6.2.2",
+    "web-component-tester": "^6.5.1"
   },
   "private": true,
   "resolutions": {
diff --git a/gr-checks/BUILD b/gr-checks/BUILD
index b56a85e..3889aae 100644
--- a/gr-checks/BUILD
+++ b/gr-checks/BUILD
@@ -5,20 +5,28 @@
 
 package(default_visibility = [":visibility"])
 
+load("@npm_bazel_rollup//:index.bzl", "rollup_bundle")
 load("//tools/bzl:js.bzl", "polygerrit_plugin")
 load("//tools/bzl:genrule2.bzl", "genrule2")
 
 polygerrit_plugin(
     name = "gr-checks",
-    srcs = glob([
-        "*.html",
-        "*.js",
-    ]),
-    app = "gr-checks.html",
-    externs = ["externs.js"],
+    app = "checks-bundle.js",
     plugin_name = "checks",
 )
 
+rollup_bundle(
+    name = "checks-bundle",
+    srcs = glob(["*.js"]),
+    entry_point = "gr-checks.js",
+    rollup_bin = "//tools/node_tools:rollup-bin",
+    sourcemap = "hidden",
+    format = 'iife',
+    deps = [
+        "@tools_npm//rollup-plugin-node-resolve",
+    ],
+)
+
 genrule2(
     name = "gr-checks-static",
     srcs = [":gr-checks"],
diff --git a/gr-checks/externs.js b/gr-checks/externs.js
deleted file mode 100644
index f14959b..0000000
--- a/gr-checks/externs.js
+++ /dev/null
@@ -1,6 +0,0 @@
-/**
- * @fileoverview externs for moment.js
- * @externs
- */
-
-function moment() {};
diff --git a/gr-checks/gr-checkers-list.js b/gr-checks/gr-checkers-list.js
index b07b861..b7441e9 100644
--- a/gr-checks/gr-checkers-list.js
+++ b/gr-checks/gr-checkers-list.js
@@ -1,14 +1,44 @@
-(function() {
-  'use strict';
-  const CHECKERS_PER_PAGE = 15;
-  const GET_CHECKERS_URL = "/plugins/checks/checkers/";
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import './gr-create-checkers-dialog.js';
+import {htmlTemplate} from './gr-checkers-list_html.js';
+
+const CHECKERS_PER_PAGE = 15;
+const GET_CHECKERS_URL = '/plugins/checks/checkers/';
+
+/**
+ * Show a list of all checkers along with creating/editing them
+ */
+class GrCheckersList extends Polymer.GestureEventListeners(
+    Polymer.LegacyElementMixin(
+        Polymer.Element)) {
+/** @returns {?} template for this component */
+  static get template() { return htmlTemplate; }
+
+  /** @returns {string} name of the component */
+  static get is() { return 'gr-checkers-list'; }
 
   /**
-   * Show a list of all checkers along with creating/editing them
+   * Defines properties of the component
+   *
+   * @returns {?}
    */
-  Polymer({
-    is: 'gr-checkers-list',
-    properties: {
+  static get properties() {
+    return {
       /**
        * Add observer on pluginRestApi to call getCheckers when it's defined
        * as initially getCheckers was being called before pluginRestApi was
@@ -32,7 +62,8 @@
       },
       _visibleCheckers: {
         type: Array,
-        computed: '_computeVisibleCheckers(_startingIndex, _filteredCheckers)',
+        computed: '_computeVisibleCheckers(' +
+            '_startingIndex, _filteredCheckers)',
       },
       _createNewCapability: {
         type: Boolean,
@@ -40,158 +71,164 @@
       },
       _startingIndex: {
         type: Number,
-        value: 0
+        value: 0,
       },
       _showNextButton: {
         type: Boolean,
         value: true,
-        computed: '_computeShowNextButton(_startingIndex, _filteredCheckers)'
+        computed: '_computeShowNextButton(_startingIndex, _filteredCheckers)',
       },
       _showPrevButton: {
         type: Boolean,
         value: true,
-        computed: '_computeShowPrevButton(_startingIndex, _filteredCheckers)'
+        computed: '_computeShowPrevButton(_startingIndex, _filteredCheckers)',
       },
-    },
-    observers: [
-      '_showCheckers(_checkers, _filter)',
-    ],
+    };
+  }
 
-    attached() {
-      /**
-       * Adding an observer to listBody element as gr-overlay does not
-       * automatically resize itself once the getCheckers response comes.
-       * Polymer 2 will deprecate use of obserNodes so replacing it
-       * with FlattenedNodesObserver
-       */
-      if (Polymer.FlattenedNodesObserver) {
-        this._checkersListObserver = new Polymer.FlattenedNodesObserver(
+  static get observers() {
+    return [
+      '_showCheckers(_checkers, _filter)',
+    ];
+  }
+
+  attached() {
+    super.attached();
+    /**
+     * Adding an observer to listBody element as gr-overlay does not
+     * automatically resize itself once the getCheckers response comes.
+     * Polymer 2 will deprecate use of obserNodes so replacing it
+     * with FlattenedNodesObserver
+     */
+    if (Polymer.FlattenedNodesObserver) {
+      this._checkersListObserver = new Polymer.FlattenedNodesObserver(
           this.$.listBody, () => {
             this.$.listOverlay.refit();
           });
-      } else {
-        this._checkersListObserver = Polymer.dom(this.$.listBody).observeNodes(
+    } else {
+      this._checkersListObserver = Polymer.dom(this.$.listBody).observeNodes(
           () => {
             this.$.listOverlay.refit();
           });
-      }
-    },
+    }
+  }
 
-    detached() {
-      Polymer.dom(this.$.listBody).unobserveNodes(this._checkersListObserver);
-    },
+  detached() {
+    super.detached();
+    Polymer.dom(this.$.listBody).unobserveNodes(this._checkersListObserver);
+  }
 
-    _contains(target, keyword) {
-      return target.toLowerCase().includes(keyword.toLowerCase().trim());
-    },
+  _contains(target, keyword) {
+    return target.toLowerCase().includes(keyword.toLowerCase().trim());
+  }
 
-    _showConfigureOverlay() {
-      this.$.listOverlay.open().then(
+  _showConfigureOverlay() {
+    this.$.listOverlay.open().then(
         () => {
           this._getCheckers();
         }
-      )
-    },
+    );
+  }
 
-    _showCheckers(_checkers, _filter) {
-      if (!_checkers) return;
-      if (!_filter) _filter = '';
-      // TODO(dhruvsri): highlight matching part
-      this._filteredCheckers = this._checkers.filter(checker =>
-        this._contains(checker.name, this._filter) ||
-        this._contains(checker.repository, this._filter))
-      this._startingIndex = 0;
-    },
+  _showCheckers(_checkers, _filter) {
+    if (!_checkers) return;
+    if (!_filter) _filter = '';
+    // TODO(dhruvsri): highlight matching part
+    this._filteredCheckers = this._checkers.filter(checker =>
+      this._contains(checker.name, this._filter) ||
+        this._contains(checker.repository, this._filter));
+    this._startingIndex = 0;
+  }
 
-    computeLoadingClass(loading) {
-      return loading ? 'loading' : '';
-    },
+  computeLoadingClass(loading) {
+    return loading ? 'loading' : '';
+  }
 
-    _computeVisibleCheckers(_startingIndex, _filteredCheckers) {
-      if (!_filteredCheckers) {
-        return [];
-      }
-      return this._filteredCheckers.slice(this._startingIndex,
+  _computeVisibleCheckers(_startingIndex, _filteredCheckers) {
+    if (!_filteredCheckers) {
+      return [];
+    }
+    return this._filteredCheckers.slice(this._startingIndex,
         this._startingIndex + CHECKERS_PER_PAGE);
-    },
+  }
 
-    _computeShowNextButton(_startingIndex, _filteredCheckers) {
-      if (!_filteredCheckers) {
-        return false;
-      }
-      return _startingIndex + CHECKERS_PER_PAGE < _filteredCheckers.length;
-    },
+  _computeShowNextButton(_startingIndex, _filteredCheckers) {
+    if (!_filteredCheckers) {
+      return false;
+    }
+    return _startingIndex + CHECKERS_PER_PAGE < _filteredCheckers.length;
+  }
 
-    _computeShowPrevButton(_startingIndex, _filteredCheckers) {
-      if (!_filteredCheckers) {
-        return false;
-      }
-      return _startingIndex >= CHECKERS_PER_PAGE;
-    },
+  _computeShowPrevButton(_startingIndex, _filteredCheckers) {
+    if (!_filteredCheckers) {
+      return false;
+    }
+    return _startingIndex >= CHECKERS_PER_PAGE;
+  }
 
-    _handleNextClicked() {
-      if (this._startingIndex + CHECKERS_PER_PAGE <
+  _handleNextClicked() {
+    if (this._startingIndex + CHECKERS_PER_PAGE <
         this._filteredCheckers.length) {
-          this._startingIndex += CHECKERS_PER_PAGE;
-      }
-    },
+      this._startingIndex += CHECKERS_PER_PAGE;
+    }
+  }
 
-    _handlePrevClicked() {
-      if (this._startingIndex >= CHECKERS_PER_PAGE) {
-        this._startingIndex -= CHECKERS_PER_PAGE;
-      }
-    },
+  _handlePrevClicked() {
+    if (this._startingIndex >= CHECKERS_PER_PAGE) {
+      this._startingIndex -= CHECKERS_PER_PAGE;
+    }
+  }
 
-    _getCheckers() {
-      if (!this.pluginRestApi) return;
-      this.pluginRestApi.get(GET_CHECKERS_URL).then(checkers => {
-        if (!checkers) { return; }
-        this._checkers = checkers;
-        this._startingIndex = 0;
-        this._loading = false;
-      });
-    },
+  _getCheckers() {
+    if (!this.pluginRestApi) return;
+    this.pluginRestApi.get(GET_CHECKERS_URL).then(checkers => {
+      if (!checkers) { return; }
+      this._checkers = checkers;
+      this._startingIndex = 0;
+      this._loading = false;
+    });
+  }
 
-    _handleEditConfirm() {
-      this.$.editModal.handleEditChecker();
-    },
+  _handleEditConfirm() {
+    this.$.editModal.handleEditChecker();
+  }
 
-    _handleEditIconClicked(e) {
-      let checker = e.model.item;
-      this.checker = checker;
-      this.$.editOverlay.open();
-    },
+  _handleEditIconClicked(e) {
+    const checker = e.model.item;
+    this.checker = checker;
+    this.$.editOverlay.open();
+  }
 
-    _handleEditCancel(e) {
-      if (e.detail.reload) {
-        this._getCheckers();
-      }
-      this.$.editOverlay.close();
-    },
+  _handleEditCancel(e) {
+    if (e.detail.reload) {
+      this._getCheckers();
+    }
+    this.$.editOverlay.close();
+  }
 
-    _computeCreateClass(createNew) {
-      return createNew ? 'show' : '';
-    },
+  _computeCreateClass(createNew) {
+    return createNew ? 'show' : '';
+  }
 
-    _computeBlocking(checker) {
-      return (checker && checker.blocking && checker.blocking.length > 0)
-        ? "YES": "NO";
-    },
+  _computeBlocking(checker) {
+    return (checker && checker.blocking && checker.blocking.length > 0)
+      ? 'YES': 'NO';
+  }
 
-    _handleCreateConfirm() {
-      this.$.createNewModal.handleCreateChecker();
-    },
+  _handleCreateConfirm() {
+    this.$.createNewModal.handleCreateChecker();
+  }
 
-    _handleCreateClicked() {
-      this.$.createOverlay.open();
-    },
+  _handleCreateClicked() {
+    this.$.createOverlay.open();
+  }
 
-    _handleCreateCancel(e) {
-      if (e.detail.reload) {
-        this._getCheckers();
-      }
-      this.$.createOverlay.close();
-    },
+  _handleCreateCancel(e) {
+    if (e.detail && e.detail.reload) {
+      this._getCheckers();
+    }
+    this.$.createOverlay.close();
+  }
+}
 
-  })
-})();
\ No newline at end of file
+customElements.define(GrCheckersList.is, GrCheckersList);
\ No newline at end of file
diff --git a/gr-checks/gr-checkers-list.html b/gr-checks/gr-checkers-list_html.js
similarity index 85%
rename from gr-checks/gr-checkers-list.html
rename to gr-checks/gr-checkers-list_html.js
index 88d2045..19f224f 100644
--- a/gr-checks/gr-checkers-list.html
+++ b/gr-checks/gr-checkers-list_html.js
@@ -1,13 +1,21 @@
-<link rel="import" href="gr-create-checkers-dialog.html">
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 
-<!-- Expects core to import these functionalities
-     gr-list-view/gr-list-view.html
-     styles/gr-form-styles.html
-     /gr-icons/gr-icons.html
-     /iron-input/iron-input.html -->
-
-<dom-module id="gr-checkers-list">
-  <template>
+export const htmlTemplate = Polymer.html`
     <style include="shared-styles"></style>
     <style include="gr-table-styles"></style>
     <style>
@@ -55,6 +63,11 @@
         text-decoration: underline;
         cursor: pointer;
       }
+      #listOverlay {
+        max-width: 90%;
+        max-height: 90%;
+        overflow: auto;
+      }
     </style>
 
     <gr-overlay on-fullscreen-overlay-closed="_handleOverlayClosed" id="listOverlay" with-backdrop>
@@ -159,6 +172,4 @@
       </gr-overlay>
     </gr-overlay>
     <gr-rest-api-interface id="restAPI"></gr-rest-api-interface>
-  </template>
-  <script src="gr-checkers-list.js"></script>
-</dom-module>
+`;
\ No newline at end of file
diff --git a/gr-checks/gr-checkers-list_test.html b/gr-checks/gr-checkers-list_test.html
index 6b5e0ad..966496c 100644
--- a/gr-checks/gr-checkers-list_test.html
+++ b/gr-checks/gr-checkers-list_test.html
@@ -1,244 +1,247 @@
 <!DOCTYPE html>
 <meta name="viewport" content="width=device-width, minimum-scale=1.0, initial-scale=1.0, user-scalable=yes">
-<script src="/bower_components/webcomponentsjs/webcomponents-lite.min.js"></script>
-<script src="/bower_components/web-component-tester/browser.js"></script>
 
-<link rel="import" href="/bower_components/polymer/polymer.html">
+<script src="/node_modules/@webcomponents/webcomponentsjs/custom-elements-es5-adapter.js"></script>
+<script src="../node_modules/@webcomponents/webcomponentsjs/webcomponents-loader.js"></script>
+<script src="../bower_components/web-component-tester/browser.js"></script>
 
 <title>gr-checkers-list-view</title>
-<link rel="import" href="gr-checkers-list.html">
 
 <test-fixture id="basic">
-  <template is="dom-template">
-    <gr-checkers-list
-      plugin-rest-api="[[pluginRestApi]]"
-    >
+  <template>
+    <gr-checkers-list>
     </gr-checkers-list>
-</template>
+  </template>
 </test-fixture>
 
-<script>
+<script type="module">
+  import '../test/common-test-setup.js';
+  import './gr-checkers-list.js';
   const CHECKERS = [
     {
-        "uuid":"C:D",
-        "name":"A",
-        "description":"B",
-        "repository":"Backend",
-        "status":"ENABLED",
-        "blocking":[
+      uuid: 'C:D',
+      name: 'A',
+      description: 'B',
+      repository: 'Backend',
+      status: 'ENABLED',
+      blocking: [
 
-        ],
-        "query":"status:open",
-        "created":"2019-07-25 13:08:43.000000000",
-        "updated":"2019-07-25 13:08:43.000000000"
+      ],
+      query: 'status:open',
+      created: '2019-07-25 13:08:43.000000000',
+      updated: '2019-07-25 13:08:43.000000000',
     },
     {
-        "uuid":"aa:bb",
-        "name":"n1",
-        "description":"d1",
-        "repository":"All-Users",
-        "status":"ENABLED",
-        "blocking":[
+      uuid: 'aa:bb',
+      name: 'n1',
+      description: 'd1',
+      repository: 'All-Users',
+      status: 'ENABLED',
+      blocking: [
 
-        ],
-        "query":"status:open",
-        "created":"2019-07-29 13:07:17.000000000",
-        "updated":"2019-07-29 13:07:17.000000000"
+      ],
+      query: 'status:open',
+      created: '2019-07-29 13:07:17.000000000',
+      updated: '2019-07-29 13:07:17.000000000',
     },
     {
-        "uuid":"adsf:asdasdas",
-        "name":"ds",
-        "description":"s",
-        "repository":"Scripts",
-        "status":"ENABLED",
-        "blocking":[
+      uuid: 'adsf:asdasdas',
+      name: 'ds',
+      description: 's',
+      repository: 'Scripts',
+      status: 'ENABLED',
+      blocking: [
 
-        ],
-        "query":"status:open",
-        "created":"2019-07-29 13:28:09.000000000",
-        "updated":"2019-07-29 13:28:09.000000000"
+      ],
+      query: 'status:open',
+      created: '2019-07-29 13:28:09.000000000',
+      updated: '2019-07-29 13:28:09.000000000',
     },
     {
-        "uuid":"ijkl:mnop",
-        "name":"abcd",
-        "description":"efgh",
-        "repository":"All-Projects",
-        "status":"ENABLED",
-        "blocking":[
+      uuid: 'ijkl:mnop',
+      name: 'abcd',
+      description: 'efgh',
+      repository: 'All-Projects',
+      status: 'ENABLED',
+      blocking: [
 
-        ],
-        "query":"status:open",
-        "created":"2019-07-29 09:33:25.000000000",
-        "updated":"2019-07-29 09:33:25.000000000"
+      ],
+      query: 'status:open',
+      created: '2019-07-29 09:33:25.000000000',
+      updated: '2019-07-29 09:33:25.000000000',
     },
     {
-        "uuid":"ngfnf:mhghgnhghn",
-        "name":"nbvfg",
-        "description":"fjhgj",
-        "repository":"All-Users",
-        "status":"ENABLED",
-        "blocking":[
+      uuid: 'ngfnf:mhghgnhghn',
+      name: 'nbvfg',
+      description: 'fjhgj',
+      repository: 'All-Users',
+      status: 'ENABLED',
+      blocking: [
 
-        ],
-        "query":"status:open",
-        "created":"2019-08-06 14:21:34.000000000",
-        "updated":"2019-08-06 14:21:34.000000000"
+      ],
+      query: 'status:open',
+      created: '2019-08-06 14:21:34.000000000',
+      updated: '2019-08-06 14:21:34.000000000',
     },
     {
-        "uuid":"sdfsdf--:sdfsdf333",
-        "name":"sdfsdf",
-        "description":"sdfsdfsd",
-        "repository":"Scripts",
-        "status":"ENABLED",
-        "blocking":[
+      uuid: 'sdfsdf--:sdfsdf333',
+      name: 'sdfsdf',
+      description: 'sdfsdfsd',
+      repository: 'Scripts',
+      status: 'ENABLED',
+      blocking: [
 
-        ],
-        "query":"status:open",
-        "created":"2019-07-30 13:00:19.000000000",
-        "updated":"2019-07-30 13:00:19.000000000"
-    },
-    {  
-        "uuid":"test:checker1",
-        "name":"Unit Tests",
-        "description":"Random description that should be improved at some point",
-        "repository":"Backend",
-        "status":"ENABLED",
-        "blocking":[
-
-        ],
-        "query":"status:open",
-        "created":"2019-07-22 13:16:52.000000000",
-        "updated":"2019-07-22 14:21:14.000000000"
+      ],
+      query: 'status:open',
+      created: '2019-07-30 13:00:19.000000000',
+      updated: '2019-07-30 13:00:19.000000000',
     },
     {
-        "uuid":"test:checker2",
-        "name":"Code Style",
-        "repository":"Backend",
-        "status":"ENABLED",
-        "blocking":[
+      uuid: 'test:checker1',
+      name: 'Unit Tests',
+      description: 'Random description that should be improved at some point',
+      repository: 'Backend',
+      status: 'ENABLED',
+      blocking: [
 
-        ],
-        "query":"status:open",
-        "created":"2019-07-22 13:26:56.000000000",
-        "updated":"2019-07-22 13:26:56.000000000"
+      ],
+      query: 'status:open',
+      created: '2019-07-22 13:16:52.000000000',
+      updated: '2019-07-22 14:21:14.000000000',
     },
     {
-        "uuid":"xddf:sdfsdfsdf",
-        "name":"sdfsdf",
-        "description":"sdfsdf",
-        "repository":"Scripts",
-        "status":"ENABLED",
-        "blocking":[
+      uuid: 'test:checker2',
+      name: 'Code Style',
+      repository: 'Backend',
+      status: 'ENABLED',
+      blocking: [
 
-        ],
-        "query":"status:open",
-        "created":"2019-07-29 14:11:59.000000000",
-        "updated":"2019-07-29 14:11:59.000000000"
+      ],
+      query: 'status:open',
+      created: '2019-07-22 13:26:56.000000000',
+      updated: '2019-07-22 13:26:56.000000000',
     },
     {
-        "uuid":"zxczxc:bnvnbvnbvn",
-        "name":"zxc",
-        "description":"zxc",
-        "repository":"Scripts",
-        "status":"ENABLED",
-        "blocking":[
+      uuid: 'xddf:sdfsdfsdf',
+      name: 'sdfsdf',
+      description: 'sdfsdf',
+      repository: 'Scripts',
+      status: 'ENABLED',
+      blocking: [
 
-        ],
-        "query":"status:open",
-        "created":"2019-07-29 14:00:24.000000000",
-        "updated":"2019-07-29 14:00:24.000000000"
+      ],
+      query: 'status:open',
+      created: '2019-07-29 14:11:59.000000000',
+      updated: '2019-07-29 14:11:59.000000000',
     },
     {
-        "uuid":"zxczxc:sdfsdf",
-        "name":"zxc",
-        "description":"zxc",
-        "repository":"Scripts",
-        "status":"ENABLED",
-        "blocking":[
+      uuid: 'zxczxc:bnvnbvnbvn',
+      name: 'zxc',
+      description: 'zxc',
+      repository: 'Scripts',
+      status: 'ENABLED',
+      blocking: [
 
-        ],
-        "query":"status:open",
-        "created":"2019-07-29 13:30:47.000000000",
-        "updated":"2019-07-29 13:30:47.000000000"
-    }
+      ],
+      query: 'status:open',
+      created: '2019-07-29 14:00:24.000000000',
+      updated: '2019-07-29 14:00:24.000000000',
+    },
+    {
+      uuid: 'zxczxc:sdfsdf',
+      name: 'zxc',
+      description: 'zxc',
+      repository: 'Scripts',
+      status: 'ENABLED',
+      blocking: [
+
+      ],
+      query: 'status:open',
+      created: '2019-07-29 13:30:47.000000000',
+      updated: '2019-07-29 13:30:47.000000000',
+    },
   ];
-</script>
-
-<script>
 
   suite('gr-checkers-list tests', () => {
     let element;
     let sandbox;
-    let fetchJSONSpy, fetchJSONPromise, fetchJSONResolve;
+    let getSpy; let getResolve;
 
-    setup((done) => {
+    setup(done => {
       sandbox = sinon.sandbox.create();
 
-      fetchJSONSpy = sinon.stub();
-      const fetchJSONPromise = new Promise((resolve, reject) => {
-      fetchJSONResolve = resolve;
-      })
-      fetchJSONSpy.returns(fetchJSONPromise)
+      getSpy = sinon.stub();
+      const getPromise = new Promise((resolve, reject) => {
+        getResolve = resolve;
+      });
+      getSpy.returns(getPromise);
 
       const pluginRestApi = {
-        fetchJSON: fetchJSONSpy,
+        get: getSpy,
       };
 
-      element = fixture('basic', {
-        pluginRestApi
-      });
+      element = fixture('basic');
+      element.pluginRestApi = pluginRestApi;
+
+      element.$.listOverlay.refit = () => {};
+      element.$.listOverlay.open = () => {
+        return Promise.resolve(() => {});
+      };
       flush(done);
     });
 
     teardown(() => { sandbox.restore(); });
 
     test('renders checker list table headings', () => {
-      const checkersList = element.$$('table')
+      const checkersList = element.$$('table');
       const headings = checkersList.firstElementChild.firstElementChild.
-                        children;
-      const expectedHeadings = ["Checker Name", "Repository", "Status",
-        "Required", "Checker Description", "Edit"];
-      for (let i = 0;i < headings.length;i++) {
-        assert(headings[i].innerText === expectedHeadings[i]);
+          children;
+      const expectedHeadings = ['Checker Name', 'Repository', 'Status',
+        'Required', 'Checker Description', 'Edit'];
+      for (let i = 0; i < headings.length; i++) {
+        assert(headings[i].innerText.trim() === expectedHeadings[i]);
       }
     });
 
     test('create checker button renders', () => {
-      assert(element.querySelector('#createNewContainer'));
-      const button = element.querySelector('#createNewContainer')
-                            .querySelector('gr-button');
+      assert(element.shadowRoot.querySelector('#createNewContainer'));
+      const button = element.shadowRoot.querySelector('#createNewContainer')
+          .querySelector('gr-button');
       assert(button);
       assert(button.innerText === 'Create New');
     });
 
     suite('with checkers', () => {
-      setup((done) => {
-        fetchJSONResolve(CHECKERS);
+      setup(done => {
+        getResolve(CHECKERS);
+        element._showConfigureOverlay();
         flush(done);
-      })
+      });
+
       test('renders correct number of checkers', () => {
-        const checkers = element.$$('table > tbody:nth-child(2)')
-                                .querySelectorAll('tr');
+        const checkers = element
+            .shadowRoot.querySelector('table > tbody:nth-child(2)')
+            .querySelectorAll('tr');
         assert(checkers.length === CHECKERS.length);
-      })
+      });
+
       test('renders correct checkers', () => {
         const checkers = element.$$('table > tbody:nth-child(2)')
-                                .querySelectorAll('tr');
-        for (let i = 0;i < checkers.length;i++) {
+            .querySelectorAll('tr');
+        for (let i = 0; i < checkers.length; i++) {
           const checkerDetails = checkers[i].querySelectorAll('td');
           assert(CHECKERS[i].name === checkerDetails[0].innerText);
           assert(CHECKERS[i].repository === checkerDetails[1].innerText);
-          const status = CHECKERS[i].status || "NO";
+          const status = CHECKERS[i].status || 'NO';
           assert(status === checkerDetails[2].innerText);
-          const checkerRequired = (CHECKERS[i].blocking && 
+          const checkerRequired = (CHECKERS[i].blocking &&
                                    CHECKERS[i].blocking.length > 0)
-                                   ? "YES": "NO";
+            ? 'YES': 'NO';
           assert(checkerRequired === checkerDetails[3].innerText);
           const description = CHECKERS[i].description || '';
           assert(description === checkerDetails[4].innerText);
         }
-      })
+      });
     });
-
   });
 </script>
diff --git a/gr-checks/gr-checks-all-statuses.js b/gr-checks/gr-checks-all-statuses.js
index c4be5bc..bdaa06f 100644
--- a/gr-checks/gr-checks-all-statuses.js
+++ b/gr-checks/gr-checks-all-statuses.js
@@ -1,76 +1,107 @@
-(function() {
-  'use strict';
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 
-  window.Gerrit = (window.Gerrit || {});
-  window.Gerrit.Checks = (window.Gerrit.Checks || {});
+/** All statuses */
+export const Statuses = {
+  // non-terminal statuses
+  NOT_STARTED: 'NOT_STARTED',
+  SCHEDULED: 'SCHEDULED',
+  RUNNING: 'RUNNING',
 
-  // Prevent redefinition.
-  if (window.Gerrit.Checks.Statuses) return;
+  // terminal statuses
+  SUCCESSFUL: 'SUCCESSFUL',
+  FAILED: 'FAILED',
+  NOT_RELEVANT: 'NOT_RELEVANT',
 
-  const Statuses = {
-    // non-terminal statuses
-    NOT_STARTED: 'NOT_STARTED',
-    SCHEDULED: 'SCHEDULED',
-    RUNNING: 'RUNNING',
+  STATUS_UNKNOWN: 'UNKNOWN',
+};
 
-    // terminal statuses
-    SUCCESSFUL: 'SUCCESSFUL',
-    FAILED: 'FAILED',
-    NOT_RELEVANT: 'NOT_RELEVANT',
+/**
+ * @param {string} status
+ * @param {Array<string>} includedStatuses
+ * @returns {boolean}
+ */
+function isStatus(status, includedStatuses) {
+  return includedStatuses.includes(status);
+}
 
-    STATUS_UNKNOWN: 'UNKNOWN'
-  };
+/**
+ * @param {string} status
+ * @returns {boolean} if status is Unevaluated.
+ */
+export function isUnevaluated(status) {
+  return isStatus(status, [Statuses.NOT_STARTED, Statuses.NOT_RELEVANT]);
+}
 
-  function isStatus(status, includedStatuses) {
-    return includedStatuses.includes(status);
-  }
+/**
+ * @param {string} status
+ * @returns {boolean} if status is Scheduled.
+ */
+export function isScheduled(status) {
+  return isStatus(status, [Statuses.SCHEDULED]);
+}
 
-  function isUnevaluated(status) {
-    return isStatus(status, [Statuses.NOT_STARTED, Statuses.NOT_RELEVANT]);
-  }
+/**
+ * @param {string} status
+ * @returns {boolean} if status is Running. */
+export function isRunning(status) {
+  return isStatus(status, [Statuses.RUNNING]);
+}
 
-  function isScheduled(status) {
-    return isStatus(status, [Statuses.SCHEDULED]);
-  }
+/**
+ * @param {string} status
+ * @returns {boolean} if status is InProgress.
+ */
+export function isInProgress(status) {
+  return isStatus(status, [Statuses.SCHEDULED, Statuses.RUNNING]);
+}
 
-  function isRunning(status) {
-    return isStatus(status, [Statuses.RUNNING]);
-  }
+/**
+ * @param {string} status
+ * @returns {boolean} if status is Successful.
+ */
+export function isSuccessful(status) {
+  return isStatus(status, [Statuses.SUCCESSFUL]);
+}
 
-  function isInProgress(status) {
-    return isStatus(status, [Statuses.SCHEDULED, Statuses.RUNNING]);
-  }
+/**
+ * @param {string} status
+ * @returns {boolean} if status is Failed.
+ */
+export function isFailed(status) {
+  return isStatus(status, [Statuses.FAILED]);
+}
 
-  function isSuccessful(status) {
-    return isStatus(status, [Statuses.SUCCESSFUL]);
-  }
-
-  function isFailed(status) {
-    return isStatus(status, [Statuses.FAILED]);
-  }
-
-  function statusClass(status) {
-    if (isUnevaluated(status)) {
-      return 'unevaluated';
-    }
-    if (isInProgress(status)) {
-      return 'in-progress';
-    }
-    if (isSuccessful(status)) {
-      return 'successful';
-    }
-    if (isFailed(status)) {
-      return 'failed';
-    }
+/**
+ * @param {string} status
+ * @returns {string} class of given status.
+ */
+export function statusClass(status) {
+  if (isUnevaluated(status)) {
     return 'unevaluated';
   }
-
-  window.Gerrit.Checks.Statuses = Statuses;
-  window.Gerrit.Checks.isUnevaluated = isUnevaluated;
-  window.Gerrit.Checks.isScheduled = isScheduled;
-  window.Gerrit.Checks.isRunning = isRunning;
-  window.Gerrit.Checks.isInProgress = isInProgress;
-  window.Gerrit.Checks.isSuccessful = isSuccessful;
-  window.Gerrit.Checks.isFailed = isFailed;
-  window.Gerrit.Checks.statusClass = statusClass;
-})();
+  if (isInProgress(status)) {
+    return 'in-progress';
+  }
+  if (isSuccessful(status)) {
+    return 'successful';
+  }
+  if (isFailed(status)) {
+    return 'failed';
+  }
+  return 'unevaluated';
+}
\ No newline at end of file
diff --git a/gr-checks/gr-checks-change-list-header-view.html b/gr-checks/gr-checks-change-list-header-view.html
deleted file mode 100644
index efdf442..0000000
--- a/gr-checks/gr-checks-change-list-header-view.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<dom-module id="gr-checks-change-list-header-view">
-  <template>
-    <style>
-      :host {
-        display: table-cell;
-        padding: 0 3px;
-      }
-    </style>
-    Checks
-  </template>
-
-  <script src="gr-checks-change-list-header-view.js"></script>
-</dom-module>
diff --git a/gr-checks/gr-checks-change-list-header-view.js b/gr-checks/gr-checks-change-list-header-view.js
index ee3b994..09d60c0 100644
--- a/gr-checks/gr-checks-change-list-header-view.js
+++ b/gr-checks/gr-checks-change-list-header-view.js
@@ -1,7 +1,38 @@
-(function() {
-'use strict';
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+class GrChecksChangeListHeaderView extends Polymer.GestureEventListeners(
+    Polymer.LegacyElementMixin(
+        Polymer.Element)) {
+  /** @returns {string} name of the component */
+  static get is() { return 'gr-checks-change-list-header-view'; }
 
-  Polymer({
-    is: 'gr-checks-change-list-header-view',
-  });
-})();
+  /** @returns {?} template for this component */
+  static get template() {
+    return Polymer.html`
+      <style>
+        :host {
+          display: table-cell;
+          padding: 0 3px;
+        }
+      </style>
+      Checks
+    `;
+  }
+}
+
+customElements.define(GrChecksChangeListHeaderView.is,
+    GrChecksChangeListHeaderView);
\ No newline at end of file
diff --git a/gr-checks/gr-checks-change-list-header-view_test.html b/gr-checks/gr-checks-change-list-header-view_test.html
index b6aa3be..f4e964d 100644
--- a/gr-checks/gr-checks-change-list-header-view_test.html
+++ b/gr-checks/gr-checks-change-list-header-view_test.html
@@ -1,29 +1,27 @@
 <!DOCTYPE html>
 <meta name="viewport" content="width=device-width, minimum-scale=1.0, initial-scale=1.0, user-scalable=yes">
-<script src="/bower_components/webcomponentsjs/webcomponents-lite.min.js"></script>
-<script src="/bower_components/web-component-tester/browser.js"></script>
-
-<link rel="import" href="/bower_components/polymer/polymer.html">
+<script src="/node_modules/@webcomponents/webcomponentsjs/custom-elements-es5-adapter.js"></script>
+<script src="../node_modules/@webcomponents/webcomponentsjs/webcomponents-loader.js"></script>
+<script src="../bower_components/web-component-tester/browser.js"></script>
 
 <title>gr-checks-change-list-header-view</title>
-<link rel="import" href="gr-checks-change-list-header-view.html">
 
 <test-fixture id="basic">
-  <template is="dom-template">
+  <template>
     <gr-checks-change-list-header-view></gr-checks-change-list-header-view>
   </template>
 </test-fixture>
 
-<script>
-
+<script type="module">
+  import '../test/common-test-setup.js';
+  import './gr-checks-change-list-header-view.js';
   suite('gr-checks-change-list-header-view tests', () => {
     let element;
     let sandbox;
 
-    setup((done) => {
+    setup(done => {
       sandbox = sinon.sandbox.create();
 
-
       element = fixture('basic');
       flush(done);
     });
@@ -31,7 +29,7 @@
     teardown(() => { sandbox.restore(); });
 
     test('renders the header', () => {
-      assert.include(element.textContent.trim(), 'Checks');
+      assert.include(element.shadowRoot.textContent, 'Checks');
     });
   });
 </script>
diff --git a/gr-checks/gr-checks-change-list-item-cell-view.html b/gr-checks/gr-checks-change-list-item-cell-view.html
deleted file mode 100644
index 8536a66..0000000
--- a/gr-checks/gr-checks-change-list-item-cell-view.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<dom-module id="gr-checks-change-list-item-cell-view">
-  <template>
-    <style>
-      :host {
-        display: inline-block;
-        text-align: center;
-        width: 100%;
-      }
-    </style>
-  </template>
-
-  <script src="gr-checks-change-list-item-cell-view.js"></script>
-</dom-module>
diff --git a/gr-checks/gr-checks-change-list-item-cell-view.js b/gr-checks/gr-checks-change-list-item-cell-view.js
index 65be586..98a75aa 100644
--- a/gr-checks/gr-checks-change-list-item-cell-view.js
+++ b/gr-checks/gr-checks-change-list-item-cell-view.js
@@ -1,11 +1,49 @@
-(function() {
-'use strict';
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+class GrChecksChangeListItemCellView extends Polymer.GestureEventListeners(
+    Polymer.LegacyElementMixin(
+        Polymer.Element)) {
+  /** @returns {string} name of the component */
+  static get is() { return 'gr-checks-change-list-item-cell-view'; }
 
-  Polymer({
-    is: 'gr-checks-change-list-item-cell-view',
+  /** @returns {?} template for this component */
+  static get template() {
+    return Polymer.html`
+      <style>
+      :host {
+        display: inline-block;
+        text-align: center;
+        width: 100%;
+      }
+    </style>
+      `;
+  }
 
-    properties: {
+  /**
+   * Defines properties of the component
+   *
+   * @returns {?}
+   */
+  static get properties() {
+    return {
       change: Object,
-    },
-  });
-})();
+    };
+  }
+}
+
+customElements.define(GrChecksChangeListItemCellView.is,
+    GrChecksChangeListItemCellView);
\ No newline at end of file
diff --git a/gr-checks/gr-checks-change-list-item-cell-view_test.html b/gr-checks/gr-checks-change-list-item-cell-view_test.html
index 24d5f6b..a8b5779 100644
--- a/gr-checks/gr-checks-change-list-item-cell-view_test.html
+++ b/gr-checks/gr-checks-change-list-item-cell-view_test.html
@@ -1,45 +1,43 @@
 <!DOCTYPE html>
 <meta name="viewport" content="width=device-width, minimum-scale=1.0, initial-scale=1.0, user-scalable=yes">
-<script src="/bower_components/webcomponentsjs/webcomponents-lite.min.js"></script>
-<script src="/bower_components/web-component-tester/browser.js"></script>
-
-<link rel="import" href="/bower_components/polymer/polymer.html">
+<script src="/node_modules/@webcomponents/webcomponentsjs/custom-elements-es5-adapter.js"></script>
+<script src="../node_modules/@webcomponents/webcomponentsjs/webcomponents-loader.js"></script>
+<script src="../bower_components/web-component-tester/browser.js"></script>
 
 <title>gr-checks-change-list-item-cell-view</title>
-<link rel="import" href="gr-checks-change-list-item-cell-view.html">
 
 <test-fixture id="basic">
-  <template is="dom-template">
-    <gr-checks-change-list-item-cell-view change="[[change]]"></gr-checks-change-list-item-cell-view>
+  <template>
+    <gr-checks-change-list-item-cell-view></gr-checks-change-list-item-cell-view>
   </template>
 </test-fixture>
 
-<script>
+<script type="module">
+  import '../test/common-test-setup.js';
+  import './gr-checks-change-list-item-cell-view.js';
 
   suite('gr-checks-change-list-item-cell-view tests', () => {
     let element;
     let sandbox;
 
-    setup((done) => {
+    setup(done => {
       sandbox = sinon.sandbox.create();
 
-
-      element = fixture('basic', {
-        change: {
-          'project': 'test-repository',
-          'revisions': {
-            'first-sha': "test-revision",
-            'second-sha': "test-revision2",
-          }
+      element = fixture('basic');
+      element.change = {
+        project: 'test-repository',
+        revisions: {
+          'first-sha': 'test-revision',
+          'second-sha': 'test-revision2',
         },
-      });
+      };
       flush(done);
     });
 
     teardown(() => { sandbox.restore(); });
 
     test('renders the element', () => {
-      assert.exists(element);
+      assert.isOk(element);
     });
   });
 </script>
diff --git a/gr-checks/gr-checks-change-view-tab-header-view.html b/gr-checks/gr-checks-change-view-tab-header-view.html
deleted file mode 100644
index e5d6dc1..0000000
--- a/gr-checks/gr-checks-change-view-tab-header-view.html
+++ /dev/null
@@ -1,7 +0,0 @@
-<dom-module id="gr-checks-change-view-tab-header-view">
-  <template>
-    Checks
-  </template>
-
-  <script src="gr-checks-change-view-tab-header-view.js"></script>
-</dom-module>
diff --git a/gr-checks/gr-checks-change-view-tab-header-view.js b/gr-checks/gr-checks-change-view-tab-header-view.js
index e77a888..4c1a022 100644
--- a/gr-checks/gr-checks-change-view-tab-header-view.js
+++ b/gr-checks/gr-checks-change-view-tab-header-view.js
@@ -1,7 +1,31 @@
-(function() {
-'use strict';
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 
-  Polymer({
-    is: 'gr-checks-change-view-tab-header-view',
-  });
-})();
+class GrChecksChangeViewTabHeaderView extends Polymer.GestureEventListeners(
+    Polymer.LegacyElementMixin(
+        Polymer.Element)) {
+  /** @returns {string} name of the component */
+  static get is() { return 'gr-checks-change-view-tab-header-view'; }
+
+  /** @returns {?} template for this component */
+  static get template() {
+    return Polymer.html`Checks`;
+  }
+}
+
+customElements.define(GrChecksChangeViewTabHeaderView.is,
+    GrChecksChangeViewTabHeaderView);
\ No newline at end of file
diff --git a/gr-checks/gr-checks-change-view-tab-header-view_test.html b/gr-checks/gr-checks-change-view-tab-header-view_test.html
index 79fb0a9..cee3780 100644
--- a/gr-checks/gr-checks-change-view-tab-header-view_test.html
+++ b/gr-checks/gr-checks-change-view-tab-header-view_test.html
@@ -1,29 +1,28 @@
 <!DOCTYPE html>
 <meta name="viewport" content="width=device-width, minimum-scale=1.0, initial-scale=1.0, user-scalable=yes">
 
-<script src="../../../bower_components/webcomponentsjs/webcomponents-lite.min.js"></script>
-<script src="/bower_components/web-component-tester/browser.js"></script>
-
-<link rel="import" href="/bower_components/polymer/polymer.html">
+<script src="/node_modules/@webcomponents/webcomponentsjs/custom-elements-es5-adapter.js"></script>
+<script src="../node_modules/@webcomponents/webcomponentsjs/webcomponents-loader.js"></script>
+<script src="../bower_components/web-component-tester/browser.js"></script>
 
 <title>gr-checks-change-view-tab-header-view</title>
-<link rel="import" href="gr-checks-change-view-tab-header-view.html">
 
 <test-fixture id="basic">
-  <template is="dom-template">
+  <template>
     <gr-checks-change-view-tab-header-view></gr-checks-change-view-tab-header-view>
   </template>
 </test-fixture>
 
-<script>
+<script type="module">
+  import '../test/common-test-setup.js';
+  import './gr-checks-change-view-tab-header-view.js';
   suite('gr-checks-change-view-tab-header-view tests', () => {
     let element;
     let sandbox;
 
-    setup((done) => {
+    setup(done => {
       sandbox = sinon.sandbox.create();
 
-
       element = fixture('basic');
       flush(done);
     });
@@ -31,7 +30,7 @@
     teardown(() => { sandbox.restore(); });
 
     test('renders the header', () => {
-      assert.include(element.textContent.trim(), 'Checks');
+      assert.include(element.shadowRoot.textContent.trim(), 'Checks');
     });
   });
 </script>
diff --git a/gr-checks/gr-checks-chip-view.html b/gr-checks/gr-checks-chip-view.html
deleted file mode 100644
index e4358b5..0000000
--- a/gr-checks/gr-checks-chip-view.html
+++ /dev/null
@@ -1,32 +0,0 @@
-<dom-module id="gr-checks-chip-view">
-  <template>
-    <style>
-
-      :host {
-        display: inline-block;
-        cursor: pointer;
-      }
-
-      .chip {
-        border-color: #D0D0D0;
-        border-radius: 4px;
-        border-style: solid;
-        border-width: 1px;
-        padding: 4px 8px;
-      }
-      .chip.failed {
-        border-color: #DA4236;
-      }
-    </style>
-    <template is="dom-if" if="[[_hasChecks]]">
-      Checks:
-      <span class$="[[_chipClasses]]">
-        <gr-checks-status status="[[_status]]" downgrade-failure-to-warning="[[_downgradeFailureToWarning]]"></gr-checks-status>
-        [[_statusString]]
-      </span>
-    </template>
-  </template>
-
-  <script src="gr-checks-all-statuses.js"></script>
-  <script src="gr-checks-chip-view.js"></script>
-</dom-module>
diff --git a/gr-checks/gr-checks-chip-view.js b/gr-checks/gr-checks-chip-view.js
index 36e4c1b..3415844 100644
--- a/gr-checks/gr-checks-chip-view.js
+++ b/gr-checks/gr-checks-chip-view.js
@@ -1,73 +1,140 @@
-(function() {
-  'use strict';
-  const Statuses = window.Gerrit.Checks.Statuses;
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import './gr-checks-status.js';
+import {statusClass, Statuses} from './gr-checks-all-statuses.js';
 
-  const StatusPriorityOrder = [
-    Statuses.FAILED,
-    Statuses.SCHEDULED,
-    Statuses.RUNNING,
-    Statuses.SUCCESSFUL,
-    Statuses.NOT_STARTED,
-    Statuses.NOT_RELEVANT,
-  ];
+const StatusPriorityOrder = [
+  Statuses.FAILED,
+  Statuses.SCHEDULED,
+  Statuses.RUNNING,
+  Statuses.SUCCESSFUL,
+  Statuses.NOT_STARTED,
+  Statuses.NOT_RELEVANT,
+];
 
-  const HumanizedStatuses = {
-    // non-terminal statuses
-    NOT_STARTED: 'in progress',
-    NOT_RELEVANT: 'not relevant',
-    SCHEDULED: 'in progress',
-    RUNNING: 'in progress',
+const HumanizedStatuses = {
+  // non-terminal statuses
+  NOT_STARTED: 'in progress',
+  NOT_RELEVANT: 'not relevant',
+  SCHEDULED: 'in progress',
+  RUNNING: 'in progress',
 
-    // terminal statuses
-    SUCCESSFUL: 'successful',
-    FAILED: 'failed',
-  };
+  // terminal statuses
+  SUCCESSFUL: 'successful',
+  FAILED: 'failed',
+};
 
-  const CHECKS_POLL_INTERVAL_MS = 60 * 1000;
+const CHECKS_POLL_INTERVAL_MS = 60 * 1000;
 
-  const Defs = {};
-  /**
-   * @typedef {{
-   *   _number: number,
-   * }}
-   */
-  Defs.Change;
-  /**
-   * @typedef {{
-   *   _number: number,
-   * }}
-   */
-  Defs.Revision;
+const Defs = {};
+/**
+ * @typedef {{
+ *   _number: number,
+ * }}
+ */
+Defs.Change;
+/**
+ * @typedef {{
+ *   _number: number,
+ * }}
+ */
+Defs.Revision;
 
-  function computeCheckStatuses(checks) {
-    return checks.reduce((accum, check) => {
-      accum[check.state] || (accum[check.state] = 0);
-      accum[check.state]++;
-      return accum;
-    }, {total: checks.length});
-  }
+/**
+ * @param {Array<Object>} checks
+ * @returns {Object}
+ */
+function computeCheckStatuses(checks) {
+  return checks.reduce((accum, check) => {
+    accum[check.state] || (accum[check.state] = 0);
+    accum[check.state]++;
+    return accum;
+  }, {total: checks.length});
+}
 
-  function downgradeFailureToWarning(checks) {
-    const hasFailedCheck = checks.some(
-      (check) => {
+/**
+ * @param {Array<Object>} checks
+ * @returns {string}
+ */
+function downgradeFailureToWarning(checks) {
+  const hasFailedCheck = checks.some(
+      check => {
         return check.state == Statuses.FAILED;
       }
-    )
-    if (!hasFailedCheck) return '';
-    const hasRequiredFailedCheck = checks.some(
-      (check) => {
+  );
+  if (!hasFailedCheck) return '';
+  const hasRequiredFailedCheck = checks.some(
+      check => {
         return check.state == Statuses.FAILED &&
                check.blocking && check.blocking.length > 0;
       }
-    )
-    return hasRequiredFailedCheck ? '' : 'set';
+  );
+  return hasRequiredFailedCheck ? '' : 'set';
+}
+
+class GrChecksChipView extends Polymer.GestureEventListeners(
+    Polymer.LegacyElementMixin(
+        Polymer.Element)) {
+  /** @returns {string} name of the component */
+  static get is() { return 'gr-checks-chip-view'; }
+
+  /** @returns {?} template for this component */
+  static get template() {
+    return Polymer.html`<style>
+
+      :host {
+        display: inline-block;
+        cursor: pointer;
+      }
+
+      .chip {
+        border-color: #D0D0D0;
+        border-radius: 4px;
+        border-style: solid;
+        border-width: 1px;
+        padding: 4px 8px;
+      }
+      .chip.failed {
+        border-color: #DA4236;
+      }
+    </style>
+    <template is="dom-if" if="[[_hasChecks]]">
+      Checks:
+      <span
+        class$="[[_chipClasses]]"
+        role="button"
+        aria-label="Open checks tab"
+      >
+        <gr-checks-status
+          status="[[_status]]"
+          downgrade-failure-to-warning="[[_downgradeFailureToWarning]]">
+        </gr-checks-status>
+        [[_statusString]]
+      </span>
+    </template>`;
   }
 
-
-  Polymer({
-    is: 'gr-checks-chip-view',
-
-    properties: {
+  /**
+   * Defines properties of the component
+   *
+   * @returns {?}
+   */
+  static get properties() {
+    return {
       revision: Object,
       change: Object,
       /** @type {function(number, number): !Promise<!Object>} */
@@ -78,132 +145,146 @@
       _status: {type: String, computed: '_computeStatus(_checkStatuses)'},
       _statusString: {
         type: String,
-        computed: '_computeStatusString(_status, _checkStatuses, _failedRequiredChecksCount)',
+        computed: '_computeStatusString(_status, _checkStatuses,' +
+         '_failedRequiredChecksCount)',
       },
       _chipClasses: {type: String, computed: '_computeChipClass(_status)'},
       // Type is set as string so that it reflects on changes
       // Polymer does not support reflecting changes in Boolean property
       _downgradeFailureToWarning: {
         type: String,
-        value: ''
+        value: '',
       },
       pollChecksInterval: Object,
       visibilityChangeListenerAdded: {
         type: Boolean,
-        value: false
-      }
-    },
+        value: false,
+      },
+    };
+  }
 
-    detached() {
-      clearInterval(this.pollChecksInterval);
-      this.unlisten(document, 'visibilitychange', '_onVisibililityChange');
-    },
+  created() {
+    super.created();
+    this.addEventListener('click',
+        () => this.showChecksTable());
+  }
 
-    observers: [
-      '_pollChecksRegularly(change, revision, getChecks)',
-    ],
+  detached() {
+    super.detached();
+    clearInterval(this.pollChecksInterval);
+    this.unlisten(document, 'visibilitychange', '_onVisibililityChange');
+  }
 
-    listeners: {
-      'click': 'showChecksTable'
-    },
+  static get observers() {
+    return [
+      '_pollChecksRegularly(change, getChecks)',
+    ];
+  }
 
-    showChecksTable() {
-      this.dispatchEvent(
+  showChecksTable() {
+    this.dispatchEvent(
         new CustomEvent(
-          'show-checks-table',
-          {
-            bubbles: true,
-            composed: true,
-            detail: {
-              tab: 'change-view-tab-content-checks'
-            }
-          })
-        );
-    },
+            'show-checks-table',
+            {
+              bubbles: true,
+              composed: true,
+              detail: {
+                tab: 'change-view-tab-header-checks',
+                scrollIntoView: true,
+              },
+            })
+    );
+  }
 
-    /**
-     * @param {!Defs.Change} change
-     * @param {!Defs.Revision} revision
-     * @param {function(number, number): !Promise<!Object>} getChecks
-     */
-    _fetchChecks(change, revision, getChecks) {
-      if (!getChecks || !change || !revision) return;
+  /**
+   * @param {!Defs.Change} change
+   * @param {function(number, number): !Promise<!Object>} getChecks
+   */
+  _fetchChecks(change, getChecks) {
+    if (!getChecks || !change) return;
 
-      getChecks(change._number, revision._number).then(checks => {
-        this.set('_hasChecks', checks.length > 0);
-        if (checks.length > 0) {
-          this._downgradeFailureToWarning =
+    // change.current_revision always points to latest patchset
+    getChecks(change._number, change.revisions[change.current_revision]
+        ._number).then(checks => {
+      this.set('_hasChecks', checks.length > 0);
+      if (checks.length > 0) {
+        this._downgradeFailureToWarning =
             downgradeFailureToWarning(checks);
-          this._failedRequiredChecksCount =
+        this._failedRequiredChecksCount =
             this.computeFailedRequiredChecksCount(checks);
-          this._checkStatuses = computeCheckStatuses(checks);
-        }
-      });
-    },
-
-    _onVisibililityChange() {
-      if (document.hidden) {
-        clearInterval(this.pollChecksInterval);
-        return;
+        this._checkStatuses = computeCheckStatuses(checks);
       }
-      this._pollChecksRegularly(this.change, this.revision, this.getChecks);
-    },
+    }, error => {
+      this.set('_hasChecks', false);
+      console.error(error);
+    });
+  }
 
-    _pollChecksRegularly(change, revision, getChecks) {
-      if (this.pollChecksInterval) {
-        clearInterval(this.pollChecksInterval);
-      }
-      const poll = () => this._fetchChecks(change, revision, getChecks);
-      poll();
-      this.pollChecksInterval = setInterval(poll, CHECKS_POLL_INTERVAL_MS)
-      if (!this.visibilityChangeListenerAdded) {
-        this.visibilityChangeListenerAdded = true;
-        this.listen(document, 'visibilitychange', '_onVisibililityChange');
-      }
-    },
+  _onVisibililityChange() {
+    if (document.hidden) {
+      clearInterval(this.pollChecksInterval);
+      return;
+    }
+    this._pollChecksRegularly(this.change, this.getChecks);
+  }
 
-    /**
-     * @param {!Object} checkStatuses The number of checks in each status.
-     * @return {string}
-     */
-    _computeStatus(checkStatuses) {
-      return StatusPriorityOrder.find(
-          status => checkStatuses[status] > 0) ||
+  _pollChecksRegularly(change, getChecks) {
+    if (this.pollChecksInterval) {
+      clearInterval(this.pollChecksInterval);
+    }
+    const poll = () => this._fetchChecks(change, getChecks);
+    poll();
+    this.pollChecksInterval = setInterval(poll, CHECKS_POLL_INTERVAL_MS);
+    if (!this.visibilityChangeListenerAdded) {
+      this.visibilityChangeListenerAdded = true;
+      this.listen(document, 'visibilitychange', '_onVisibililityChange');
+    }
+  }
+
+  /**
+   * @param {!Object} checkStatuses The number of checks in each status.
+   * @return {string}
+   */
+  _computeStatus(checkStatuses) {
+    return StatusPriorityOrder.find(
+        status => checkStatuses[status] > 0) ||
           Statuses.STATUS_UNKNOWN;
-    },
+  }
 
-    computeFailedRequiredChecksCount(checks) {
-      const failedRequiredChecks = checks.filter(
+  computeFailedRequiredChecksCount(checks) {
+    const failedRequiredChecks = checks.filter(
         check => {
           return check.state == Statuses.FAILED &&
             check.blocking && check.blocking.length > 0;
         }
-      );
-      return failedRequiredChecks.length;
-    },
+    );
+    return failedRequiredChecks.length;
+  }
 
-    /**
-     * @param {string} status The overall status of the checks.
-     * @param {!Object} checkStatuses The number of checks in each status.
-     * @return {string}
-     */
-    _computeStatusString(status, checkStatuses, failedRequiredChecksCount) {
-      if (!checkStatuses) return;
-      if (checkStatuses.total === 0) return 'No checks';
-      let statusString = `${checkStatuses[status]} of ${
-          checkStatuses.total} checks ${HumanizedStatuses[status]}`;
-      if (status === Statuses.FAILED && failedRequiredChecksCount > 0) {
-        statusString += ` (${failedRequiredChecksCount} required)`;
-      }
-      return statusString;
-    },
+  /**
+   * @param {string} status The overall status of the checks.
+   * @param {!Object} checkStatuses The number of checks in each status.
+   * @param {number} failedRequiredChecksCount The number of failed required checks.
+   * @return {string}
+   */
+  _computeStatusString(status, checkStatuses, failedRequiredChecksCount) {
+    if (!checkStatuses) return;
+    if (checkStatuses.total === 0) return 'No checks';
+    let statusString = `${checkStatuses[status]} of ${
+      checkStatuses.total} checks ${HumanizedStatuses[status]}`;
+    if (status === Statuses.FAILED && failedRequiredChecksCount > 0) {
+      statusString += ` (${failedRequiredChecksCount} required)`;
+    }
+    return statusString;
+  }
 
-    /**
-     * @param {string} status The overall status of the checks.
-     * @return {string}
-     */
-    _computeChipClass(status) {
-      return `chip ${window.Gerrit.Checks.statusClass(status)}`;
-    },
-  });
-})();
+  /**
+   * @param {string} status The overall status of the checks.
+   * @return {string}
+   */
+  _computeChipClass(status) {
+    return `chip ${statusClass(status)}`;
+  }
+}
+
+customElements.define(GrChecksChipView.is, GrChecksChipView);
\ No newline at end of file
diff --git a/gr-checks/gr-checks-chip-view_test.html b/gr-checks/gr-checks-chip-view_test.html
index b13a855..f5a02b3 100644
--- a/gr-checks/gr-checks-chip-view_test.html
+++ b/gr-checks/gr-checks-chip-view_test.html
@@ -1,33 +1,33 @@
 <!DOCTYPE html>
 <meta name="viewport" content="width=device-width, minimum-scale=1.0, initial-scale=1.0, user-scalable=yes">
-<script src="../../../bower_components/webcomponentsjs/webcomponents-lite.min.js"></script>
-<script src="/bower_components/web-component-tester/browser.js"></script>
-
-<link rel="import" href="/bower_components/polymer/polymer.html">
+<script src="/node_modules/@webcomponents/webcomponentsjs/custom-elements-es5-adapter.js"></script>
+<script src="../node_modules/@webcomponents/webcomponentsjs/webcomponents-loader.js"></script>
+<script src="../bower_components/web-component-tester/browser.js"></script>
 
 <title>gr-checks-chip-view</title>
-<link rel="import" href="gr-checks-chip-view.html">
 
 <test-fixture id="basic">
-  <template is="dom-template">
-    <gr-checks-chip-view change="[[change]]" revision="[[revision]]" get-checks="[[getChecks]]"></gr-checks-chip-view>
+  <template>
+    <gr-checks-chip-view></gr-checks-chip-view>
   </template>
 </test-fixture>
 
-<script>
+<script type="module">
+  import '../test/common-test-setup.js';
+  import './gr-checks-chip-view.js';
   const CHECK1 = {
     checkId: 'test-check-id',
     log: 'http://example.com/test-log-url',
-    started: "2019-02-06T22:25:19.269Z",
-    finished: "2019-02-06T22:25:44.574Z",
+    started: '2019-02-06T22:25:19.269Z',
+    finished: '2019-02-06T22:25:44.574Z',
     state: 'SUCCESSFUL',
   };
 
   const CHECK2 = {
     checkId: 'test-check-id-2',
     log: 'http://example.com/test-log-url',
-    started: "2019-02-06T22:25:19.269Z",
-    finished: "2019-02-06T22:25:44.574Z",
+    started: '2019-02-06T22:25:19.269Z',
+    finished: '2019-02-06T22:25:44.574Z',
     state: 'FAILED',
   };
 
@@ -36,28 +36,41 @@
     let sandbox;
     let getChecksSpy;
 
-    setup((done) => {
+    setup(done => {
       sandbox = sinon.sandbox.create();
 
       getChecksSpy = sinon.stub();
       getChecksSpy.returns(Promise.resolve([CHECK1, CHECK2, CHECK1]));
 
-      element = fixture('basic', {
-        getChecks: getChecksSpy,
-        change: {
-          '_number': 314,
+      element = fixture('basic');
+      element.getChecks = getChecksSpy;
+      element.change = {
+        _number: 314,
+        current_revision: 'abcd',
+        revisions: {
+          abcd: {
+            _number: 271,
+          },
         },
-        revision: {
-          '_number': 271,
-        },
-      });
+      };
+      element.revision = {
+        _number: 271,
+      };
       flush(done);
     });
 
     teardown(() => { sandbox.restore(); });
 
     test('renders the checks prefix', () => {
-      assert.include(element.textContent.trim(), 'Checks:');
+      assert.include(element.shadowRoot.textContent.trim(), 'Checks:');
+    });
+
+    test('updating revision does not update getChecks call', done => {
+      element.revision = {_number: 272};
+      flush(() => {
+        assert.isFalse(getChecksSpy.calledWith(314, 272));
+        done();
+      });
     });
 
     suite('builds chip contents', () => {
diff --git a/gr-checks/gr-checks-item.html b/gr-checks/gr-checks-item.html
deleted file mode 100644
index 096408c..0000000
--- a/gr-checks/gr-checks-item.html
+++ /dev/null
@@ -1,64 +0,0 @@
-<dom-module id="gr-checks-item">
-  <template>
-    <style>
-      :host {
-        border-top: 1px solid #ddd;
-      }
-
-      td:first-child {
-        padding-left: 1rem;
-      }
-
-      td {
-        padding: 1px 32px 1px 0;
-        white-space: nowrap;
-      }
-
-      a.log {
-        margin-right: 16px;
-        display: inline-block;
-      }
-      .nav-icon {
-        cursor: pointer;
-      }
-    </style>
-    <td>
-      <template is="dom-if" if="[[check.message]]">
-          <iron-icon class="nav-icon" on-click="_toggleMessageShown"
-            icon="[[_computeExpandIcon(showCheckMessage)]]">
-          </iron-icon>
-      </template>
-    </td>
-    <td>[[check.checker_name]]</td>
-    <td>[[_requiredForMerge]]</td>
-    <td>
-      <gr-checks-status show-text status="[[check.state]]" downgrade-failure-to-warning="[[false]]"></gr-checks-status>
-    </td>
-    <td><!--Check System--></td>
-    <td>
-      <gr-date-formatter
-        has-tooltip
-        show-date-and-time
-        date-str="[[_startTime]]">
-      </gr-date-formatter>
-    </td>
-    <td>[[_duration]]</td>
-    <td>
-      <a href$="[[check.url]]" target="_blank" class="log">
-        <gr-button link no-uppercase disabled="[[!check.url]]">
-          View log
-        </gr-button>
-      </a>
-    </td>
-    <td>
-      <gr-button
-        link
-        no-uppercase
-        on-click="_handleReRunClicked">
-        Re-run
-      </gr-button>
-    </td>
-    <td>[[check.checker_description]]</td>
-  </template>
-  <script src="gr-checks-item.js"></script>
-</dom-module>
diff --git a/gr-checks/gr-checks-item.js b/gr-checks/gr-checks-item.js
index 572ba2e..494a330 100644
--- a/gr-checks/gr-checks-item.js
+++ b/gr-checks/gr-checks-item.js
@@ -1,30 +1,127 @@
-(function() {
-  'use strict';
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import './gr-checks-status.js';
 
-  const Defs = {};
+const Defs = {};
+/**
+ * @typedef {{
+ *   project: string,
+ *   change_number: number,
+ *   patch_set_id: number,
+ *   checker_uuid: string,
+ *   state: string,
+ *   url: string,
+ *   started: string,
+ *   finished: string,
+ *   created: string,
+ *   updated: string,
+ *   checker_name: string,
+ *   checker_status: string,
+ *   blocking: Array<Object>,
+ * }}
+ */
+Defs.Check;
+
+class GrChecksItem extends Polymer.GestureEventListeners(
+    Polymer.LegacyElementMixin(
+        Polymer.Element)) {
+  /** @returns {string} name of the component */
+  static get is() { return 'gr-checks-item'; }
+
+  /** @returns {?} template for this component */
+  static get template() {
+    return Polymer.html`
+          <style>
+      :host {
+        border-top: 1px solid var(--border-color);
+      }
+
+      td:first-child {
+        padding-left: 1rem;
+      }
+
+      td {
+        padding: 1px 32px 1px 0;
+        white-space: nowrap;
+      }
+
+      a.log {
+        margin-right: 16px;
+        display: inline-block;
+      }
+      .nav-icon {
+        cursor: pointer;
+      }
+      .duration {
+        text-align: center;
+      }
+    </style>
+    <td>
+      <template is="dom-if" if="[[check.message]]">
+          <iron-icon
+            class="nav-icon expand-message"
+            on-click="_toggleMessageShown"
+            icon="[[_computeExpandIcon(showCheckMessage)]]">
+          </iron-icon>
+      </template>
+    </td>
+    <td>[[check.checker_name]]</td>
+    <td>[[_requiredForMerge]]</td>
+    <td>
+      <gr-checks-status
+        show-text
+        status="[[check.state]]"
+        downgrade-failure-to-warning="[[false]]">
+      </gr-checks-status>
+    </td>
+    <td>
+      <gr-date-formatter
+        has-tooltip
+        show-date-and-time
+        date-str="[[_startTime]]">
+      </gr-date-formatter>
+    </td>
+    <td class="duration">[[_duration]]</td>
+    <td>
+      <a href$="[[check.url]]" target="_blank" class="log">
+        <gr-button link no-uppercase disabled="[[!check.url]]">
+          Details
+        </gr-button>
+      </a>
+    </td>
+    <td>
+      <gr-button
+        link
+        no-uppercase
+        on-click="_handleReRunClicked">
+        Re-run
+      </gr-button>
+    </td>
+    <td>[[check.checker_description]]</td>
+      `;
+  }
+
   /**
-   * @typedef {{
-   *   project: string,
-   *   change_number: number,
-   *   patch_set_id: number,
-   *   checker_uuid: string,
-   *   state: string,
-   *   url: string,
-   *   started: string,
-   *   finished: string,
-   *   created: string,
-   *   updated: string,
-   *   checker_name: string,
-   *   checker_status: string,
-   *   blocking: Array<Object>,
-   * }}
+   * Defines properties of the component
+   *
+   * @returns {?}
    */
-  Defs.Check;
-
-  Polymer({
-    is: 'gr-checks-item',
-
-    properties: {
+  static get properties() {
+    return {
       /** @type {Defs.Check} */
       check: Object,
       /** @type {function(string): !Promise<!Object>} */
@@ -38,106 +135,124 @@
       },
       _requiredForMerge: {
         type: String,
-        computed: '_computeRequiredForMerge(check)'
+        computed: '_computeRequiredForMerge(check)',
       },
       showCheckMessage: {
         type: Boolean,
         value: false,
-      }
-    },
-
-    /**
-     * Fired when the retry check button is pressed.
-     *
-     * @event retry-check
-     */
-
-
-    /**
-     * @param {!Defs.Check} check
-     * @return {string}
-     */
-    _computeStartTime(check) {
-      if (!check.started) return "-";
-      return check.started;
-    },
-
-    _toggleMessageShown() {
-      this.showCheckMessage = !this.showCheckMessage;
-      this.fire('toggle-check-message', {uuid: this.check.checker_uuid})
-    },
-
-    _computeExpandIcon(showCheckMessage) {
-      return showCheckMessage ? "gr-icons:expand-less": "gr-icons:expand-more";
-    },
-
-    /**
-     * @param {!Defs.Check} check
-     * @return {string}
-     */
-    _computeDuration(check) {
-      if (!check.started || !check.finished) {
-        return "-";
-      }
-      const startTime = moment(check.started);
-      const finishTime = check.finished ? moment(check.finished) : moment();
-      return generateDurationString(
-          moment.duration(finishTime.diff(startTime)));
-    },
-
-    /**
-     * @param {!Defs.Check} check
-     * @return {string}
-     */
-    _computeRequiredForMerge(check) {
-      return (check.blocking && check.blocking.length === 0) ? "Optional" : "Required";
-    },
-    _handleReRunClicked(event) {
-      this.fire('retry-check',{uuid: this.check.checker_uuid},
-        {bubbles: false});
-    },
-  });
-
-  const ZERO_SECONDS = '0 sec';
-
-  /**
-   * @param {!Moment.Duration} duration a moment object
-   * @return {string}
-   */
-  function generateDurationString(duration) {
-    if (duration.asSeconds() === 0) {
-      return ZERO_SECONDS;
-    }
-
-    const durationSegments = [];
-    if (duration.months()) {
-      const months = pluralize(duration.months(), 'month', 'months');
-      durationSegments.push(`${duration.months()} ${months}`);
-    }
-    if (duration.days()) {
-      const days = pluralize(duration.days(), 'day', 'days');
-      durationSegments.push(`${duration.days()} ${days}`);
-    }
-    if (duration.hours()) {
-      const hours = pluralize(duration.hours(), 'hour', 'hours');
-      durationSegments.push(`${duration.hours()} ${hours}`);
-    }
-    if (duration.minutes()) {
-      durationSegments.push(`${duration.minutes()} min`);
-    }
-    if (duration.seconds()) {
-      durationSegments.push(`${duration.seconds()} sec`);
-    }
-    return durationSegments.slice(0, 2).join(' ');
+      },
+    };
   }
 
   /**
-   * @param {number} unit
-   * @param {string} singular
-   * @param {string} plural
+   * Fired when the retry check button is pressed.
+   *
+   * @event retry-check
+   */
+
+  /**
+   * @param {!Defs.Check} check
    * @return {string}
    */
-  function pluralize(unit, singular, plural) {
-    return unit === 1 ? singular : plural;
+  _computeStartTime(check) {
+    if (!check.started) return '-';
+    return check.started;
   }
-})();
+
+  _toggleMessageShown() {
+    this.showCheckMessage = !this.showCheckMessage;
+    this.dispatchEvent(new CustomEvent('toggle-check-message',
+        {
+          detail: {uuid: this.check.checker_uuid},
+          bubbles: true,
+          composed: true,
+        }));
+  }
+
+  _computeExpandIcon(showCheckMessage) {
+    return showCheckMessage ? 'gr-icons:expand-less': 'gr-icons:expand-more';
+  }
+
+  /**
+   * @param {!Defs.Check} check
+   * @return {string}
+   */
+  _computeDuration(check) {
+    if (!check.started || !check.finished) {
+      return '-';
+    }
+    const startTime = new Date(check.started);
+    const finishTime = check.finished ? new Date(check.finished) : new Date();
+    return generateDurationString(startTime, finishTime);
+  }
+
+  /**
+   * @param {!Defs.Check} check
+   * @return {string}
+   */
+  _computeRequiredForMerge(check) {
+    return (check.blocking && check.blocking.length === 0) ? 'Optional' :
+      'Required';
+  }
+
+  _handleReRunClicked() {
+    this.dispatchEvent(new CustomEvent('retry-check',
+        {
+          detail: {uuid: this.check.checker_uuid},
+          bubbles: false,
+          composed: true,
+        }));
+  }
+}
+
+customElements.define(GrChecksItem.is, GrChecksItem);
+
+const ZERO_SECONDS = '0 sec';
+
+/**
+ * @param {Date} startTime
+ * @param {Date} endTime
+ * @return {string}
+ */
+function generateDurationString(startTime, endTime) {
+  const secondsAgo = Math.round((endTime - startTime) / 1000);
+
+  if (secondsAgo === 0) {
+    return ZERO_SECONDS;
+  }
+
+  const durationSegments = [];
+  if (secondsAgo % 60 !== 0) {
+    durationSegments.push(`${secondsAgo % 60} sec`);
+  }
+  const minutesAgo = Math.round(secondsAgo / 60);
+  if (minutesAgo % 60 !== 0) {
+    durationSegments.push(`${minutesAgo % 60} min`);
+  }
+  const hoursAgo = Math.round(minutesAgo / 60);
+  if (hoursAgo % 24 !== 0) {
+    const hours = pluralize(hoursAgo % 24, 'hour', 'hours');
+    durationSegments.push(`${hoursAgo % 24} ${hours}`);
+  }
+  const daysAgo = Math.round(hoursAgo / 24);
+  if (daysAgo % 30 !== 0) {
+    const days = pluralize(daysAgo % 30, 'day', 'days');
+    durationSegments.push(`${daysAgo % 30} ${days}`);
+  }
+  const monthsAgo = Math.round(daysAgo / 30);
+  if (monthsAgo > 0) {
+    const months = pluralize(monthsAgo, 'month', 'months');
+    durationSegments.push(`${monthsAgo} ${months}`);
+  }
+  return durationSegments.reverse().slice(0, 2).join(' ');
+}
+
+/**
+ * @param {number} unit
+ * @param {string} singular
+ * @param {string} plural
+ * @return {string}
+ */
+function pluralize(unit, singular, plural) {
+  return unit === 1 ? singular : plural;
+}
\ No newline at end of file
diff --git a/gr-checks/gr-checks-item_test.html b/gr-checks/gr-checks-item_test.html
index 826f99d..e9ce401 100644
--- a/gr-checks/gr-checks-item_test.html
+++ b/gr-checks/gr-checks-item_test.html
@@ -1,99 +1,93 @@
 <!DOCTYPE html>
 <meta name="viewport" content="width=device-width, minimum-scale=1.0, initial-scale=1.0, user-scalable=yes">
-<script src="../../../bower_components/webcomponentsjs/webcomponents.js"></script>
-<script src="/bower_components/web-component-tester/browser.js"></script>
-<script src="../../../bower_components/moment/min/moment.min.js"></script>
-<link rel="import" href="/bower_components/polymer/polymer.html">
+<script src="/node_modules/@webcomponents/webcomponentsjs/custom-elements-es5-adapter.js"></script>
+<script src="../node_modules/@webcomponents/webcomponentsjs/webcomponents-loader.js"></script>
+<script src="../bower_components/web-component-tester/browser.js"></script>
 
 <title>gr-checks-item</title>
-<link rel="import" href="gr-checks-item.html">
 
 <test-fixture id="basic">
-  <template is="dom-template">
-    <gr-checks-item
-      check="{{check}}"
-      retry-check="[[retryCheck]]">
-    </gr-checks-item>
+  <template>
+    <gr-checks-item></gr-checks-item>
   </template>
 </test-fixture>
 
-<script>
+<script type="module">
+  import '../test/common-test-setup.js';
+  import './gr-checks-item.js';
+  const CHECKS_ITEM = {
+    MESSAGE: 1,
+    NAME: 2,
+    BLOCKING: 3,
+    STATUS: 4,
+    START_TIME: 5,
+    DURATION: 6,
+    DETAILS: 7,
+    RERUN: 8,
+    DESCRIPTION: 9,
+  };
   suite('gr-checks-item tests', () => {
     let element;
     let sandbox;
     let retryCheckSpy;
 
-    setup((done) => {
+    setup(done => {
       sandbox = sinon.sandbox.create();
       retryCheckSpy = sinon.stub();
       retryCheckSpy.returns(Promise.resolve());
 
-      element = fixture('basic', {
-        retryCheck: retryCheckSpy,
-        check: {
-          checkId: 'test-check-id',
-          url: 'http://example.com/test-log-url',
-          started: "2019-02-06T22:25:19.269Z",
-          finished: "2019-02-06T22:25:44.574Z",
-        },
-      });
+      element = fixture('basic');
+      element.retryCheck = retryCheckSpy;
+      element.check = {
+        checkId: 'test-check-id',
+        url: 'http://example.com/test-log-url',
+        started: '2019-02-06T22:25:19.269Z',
+        finished: '2019-02-06T22:25:44.574Z',
+      };
       flush(done);
     });
 
     teardown(() => { sandbox.restore(); });
 
     test('renders the status', () => {
-      const status = element.$$('td:nth-child(4) > gr-checks-status');
-      assert.exists(status);
+      const idx = CHECKS_ITEM.STATUS;
+      const status = element.shadowRoot
+          .querySelector(`td:nth-of-type(${idx}) > gr-checks-status`);
+      assert.isOk(status);
     });
 
-    test('renders the run time', () => {
-      const name = element.$$('td:nth-child(6)');
-      assert.equal(name .textContent.trim(), "11:25:19 PM");
+    test('renders the start time', () => {
+      assert.equal(element._startTime, '2019-02-06T22:25:19.269Z');
     });
 
     suite('duration', () => {
       test('renders the run duration', () => {
-        const name = element.$$('td:nth-child(7)');
-        assert.equal(name .textContent.trim(), "25 sec");
+        const idx = CHECKS_ITEM.DURATION;
+        const name = element.$$(`td:nth-of-type(${idx})`);
+        assert.equal(name.textContent.trim(), '25 sec');
       });
 
       test('renders 0 sec when the start and end time are the same', () => {
         element.check = {
           checkId: 'test-check-id',
           url: 'http://example.com/test-log-url',
-          started: "2019-02-06T22:25:19.269Z",
-          finished: "2019-02-06T22:25:19.269Z",
+          started: '2019-02-06T22:25:19.269Z',
+          finished: '2019-02-06T22:25:19.269Z',
         };
-        const name = element.$$('td:nth-child(7)');
-        assert.equal(name .textContent.trim(), "0 sec");
+        const idx = CHECKS_ITEM.DURATION;
+        const name = element.shadowRoot
+            .querySelector(`td:nth-of-type(${idx})`);
+        assert.equal(name.textContent.trim(), '0 sec');
       });
     });
 
     test('renders a link to the log', () => {
-      const logLink = element.$$('td:nth-child(8) > a');
-      assert.equal(logLink.getAttribute('href'), "http://example.com/test-log-url");
-      assert.equal(logLink.textContent.trim(), "View log");
+      const idx = CHECKS_ITEM.DETAILS;
+      const logLink = element.shadowRoot
+          .querySelector(`td:nth-of-type(${idx}) > a`);
+      assert.equal(logLink.getAttribute('href'),
+          'http://example.com/test-log-url');
+      assert.equal(logLink.textContent.trim(), 'Details');
     });
-
-    // pausing this check until retry api is available from backend
-    // suite('retryCheck', () => {
-    //   let retryCheckLink;
-
-    //   setup(() => {
-    //     retryCheckLink = element.$$('td:nth-child(7) > gr-button');
-    //   });
-
-    //   test('shows a link to the retry button', () => {
-    //     assert.equal(retryCheckLink.textContent.trim(), "Re-run");
-    //   });
-
-    //   test('clicking on the link calls the retryCheck property', () => {
-    //     assert.isFalse(retryCheckSpy.called);
-    //     retryCheckLink.click();
-    //     assert.isTrue(retryCheckSpy.called);
-    //   });
-    // });
-
   });
 </script>
diff --git a/gr-checks/gr-checks-status.js b/gr-checks/gr-checks-status.js
index 908fde5..3a22f2e 100644
--- a/gr-checks/gr-checks-status.js
+++ b/gr-checks/gr-checks-status.js
@@ -1,46 +1,77 @@
-(function() {
-'use strict';
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import {htmlTemplate} from './gr-checks-status_html.js';
+import {isUnevaluated, isInProgress, isRunning, isScheduled, isSuccessful, isFailed} from './gr-checks-all-statuses.js';
 
-  Polymer({
-    is: 'gr-checks-status',
+class GrChecksStatus extends Polymer.GestureEventListeners(
+    Polymer.LegacyElementMixin(
+        Polymer.Element)) {
+  /** @returns {string} name of the component */
+  static get is() { return 'gr-checks-status'; }
 
-    properties: {
+  /** @returns {?} template for this component */
+  static get template() { return htmlTemplate; }
+
+  /**
+   * Defines properties of the component
+   *
+   * @returns {?}
+   */
+  static get properties() {
+    return {
       showText: {
         type: Boolean,
         value: false,
         reflectToAttribute: true,
       },
       status: String,
-      downgradeFailureToWarning: String
-    },
+      downgradeFailureToWarning: String,
+    };
+  }
 
-    _isUnevaluated(status) {
-      return window.Gerrit.Checks.isUnevaluated(status);
-    },
+  _isUnevaluated(status) {
+    return isUnevaluated(status);
+  }
 
-    _isInProgress(status) {
-      return window.Gerrit.Checks.isInProgress(status);
-    },
+  _isInProgress(status) {
+    return isInProgress(status);
+  }
 
-    _isRunning(status) {
-      return window.Gerrit.Checks.isRunning(status);
-    },
+  _isRunning(status) {
+    return isRunning(status);
+  }
 
-    _isScheduled(status) {
-      return window.Gerrit.Checks.isScheduled(status);
-    },
+  _isScheduled(status) {
+    return isScheduled(status);
+  }
 
-    _isSuccessful(status) {
-      return window.Gerrit.Checks.isSuccessful(status);
-    },
+  _isSuccessful(status) {
+    return isSuccessful(status);
+  }
 
-    _isFailed(status) {
-      return !this.downgradeFailureToWarning && window.Gerrit.Checks.isFailed(status);
-    },
+  _isFailed(status) {
+    return !this.downgradeFailureToWarning &&
+        isFailed(status);
+  }
 
-    _isWarning(status) {
-      return this.downgradeFailureToWarning && window.Gerrit.Checks.isFailed(status);
-    },
+  _isWarning(status) {
+    return this.downgradeFailureToWarning &&
+        isFailed(status);
+  }
+}
 
-  });
-})();
+customElements.define(GrChecksStatus.is, GrChecksStatus);
\ No newline at end of file
diff --git a/gr-checks/gr-checks-status.html b/gr-checks/gr-checks-status_html.js
similarity index 86%
rename from gr-checks/gr-checks-status.html
rename to gr-checks/gr-checks-status_html.js
index 0341a3f..0325b95 100644
--- a/gr-checks/gr-checks-status.html
+++ b/gr-checks/gr-checks-status_html.js
@@ -1,5 +1,21 @@
-<dom-module id="gr-checks-status">
-  <template>
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+export const htmlTemplate = Polymer.html`
       <style>
         :host {
           display: inline-block;
@@ -102,7 +118,4 @@
         </template>
       </template>
     </span>
-  </template>
-  <script src="gr-checks-all-statuses.js"></script>
-  <script src="gr-checks-status.js"></script>
-</dom-module>
+`;
\ No newline at end of file
diff --git a/gr-checks/gr-checks-status_test.html b/gr-checks/gr-checks-status_test.html
index bc59777..3963dc4 100644
--- a/gr-checks/gr-checks-status_test.html
+++ b/gr-checks/gr-checks-status_test.html
@@ -1,22 +1,21 @@
 <!DOCTYPE html>
 <meta name="viewport" content="width=device-width, minimum-scale=1.0, initial-scale=1.0, user-scalable=yes">
-<script src="../../../bower_components/webcomponentsjs/webcomponents-lite.min.js"></script>
-<script src="/bower_components/web-component-tester/browser.js"></script>
-
-<link rel="import" href="/bower_components/polymer/polymer.html">
+<script src="/node_modules/@webcomponents/webcomponentsjs/custom-elements-es5-adapter.js"></script>
+<script src="../node_modules/@webcomponents/webcomponentsjs/webcomponents-loader.js"></script>
+<script src="../bower_components/web-component-tester/browser.js"></script>
 
 <title>gr-checks-item</title>
-<link rel="import" href="gr-checks-status.html">
 
 <test-fixture id="basic">
-  <template is="dom-template">
-    <gr-checks-status show-text="{{showText}}" status="{{status}}"></gr-checks-status>
+  <template>
+    <gr-checks-status></gr-checks-status>
   </template>
 </test-fixture>
 
-<script>
+<script type="module">
+  import '../test/common-test-setup.js';
+  import './gr-checks-status.js';
   suite('gr-checks-status tests', () => {
-    let element;
     let sandbox;
 
     setup(() => {
@@ -27,28 +26,26 @@
 
     function testStatus(expectedStatusClass, statusText, statusesToTest) {
       suite(expectedStatusClass, () => {
-
-        for(let statusToTest of statusesToTest) {
-          test(`renders ${expectedStatusClass} for ${statusToTest}`, (done) => {
-            const element = fixture('basic', {
-              status: statusToTest,
-              showText: false,
-            });
+        for (const statusToTest of statusesToTest) {
+          test(`renders ${expectedStatusClass} for ${statusToTest}`, done => {
+            const element = fixture('basic');
+            element.status = statusToTest;
+            element.showText = false;
 
             flush(() => {
-              const svg = element.$$(`span svg`);
-              assert.exists(svg);
+              const svg = element.shadowRoot.querySelector(`span svg`);
+              assert.isOk(svg);
               done();
             });
           });
-          test(`renders ${expectedStatusClass} for ${statusToTest} rendering text ${statusText}`, (done) => {
-            const element = fixture('basic', {
-              status: statusToTest,
-              showText: true,
-            });
+          test(`renders ${expectedStatusClass} for ${statusToTest} rendering
+            text ${statusText}`, done => {
+            const element = fixture('basic');
+            element.status = statusToTest;
+            element.showText = true;
 
             flush(() => {
-              const text = element.$$(`span span`);
+              const text = element.shadowRoot.querySelector(`span span`);
               assert.equal(text.textContent.trim(), statusText);
               done();
             });
diff --git a/gr-checks/gr-checks-view.html b/gr-checks/gr-checks-view.html
deleted file mode 100644
index 205dbe6..0000000
--- a/gr-checks/gr-checks-view.html
+++ /dev/null
@@ -1,173 +0,0 @@
-<link rel="import" href="gr-checks-status.html">
-<link rel="import" href="gr-checkers-list.html">
-
-<dom-module id="gr-checks-view">
-  <template>
-    <style>
-      :host {
-        display: block;
-        width: 100%;
-        overflow: auto;
-      }
-
-      table {
-        width: 100%;
-      }
-
-      gr-checks-item {
-        display: table-row;
-      }
-
-      .headerRow {
-        border-bottom: 1px solid #ddd;
-      }
-
-      .topHeader {
-        padding-right: 32px;
-        padding-bottom: 4px;
-        text-align: left;
-        white-space: nowrap;
-      }
-
-      th.topHeader:last-child {
-        width: 100%;
-      }
-
-      h2 {
-        font-size: 1.17em;
-        font-weight: 500;
-      }
-
-      h3 {
-        flex: 1;
-        font-size: 1.17em;
-        font-weight: 500;
-        margin-bottom: 1.5rem;
-      }
-
-      header {
-        display: flex;
-        margin: 1rem 1rem 0;
-      }
-
-      table {
-        margin-bottom: 16px;
-      }
-
-      th:first-child {
-        padding-left: 1rem;
-      }
-
-      .no-content {
-        min-height: 106px;
-        padding: 24px 0;
-        text-align: center;
-      }
-
-      /* Add max-width 1px to check-message make sure content doesn't
-         expand beyond the table width */
-      .check-message {
-        padding-left: 1rem;
-        background: var(--table-subheader-background-color);
-        max-width: 1px;
-      }
-
-      .message {
-        white-space: pre-wrap;
-        word-wrap: break-word;
-      }
-
-      .message-heading {
-        font-weight: bold;
-        margin-top: 1em;
-      }
-
-      .check-message-heading {
-        padding-left: 1em;
-      }
-
-      .configure-button {
-        float:right;
-        margin-top: 10px;
-      }
-
-      #listOverlay {
-        width: 75%;
-      }
-    </style>
-
-    <template is="dom-if" if="[[_createCheckerCapability]]">
-      <gr-button class="configure-button" on-click="_handleConfigureClicked"> Configure </gr-button>
-    </template>
-
-    <template is="dom-if" if="[[_isLoading(_status)]]">
-      <div class="no-content">
-        <p>Loading...</p>
-      </div>
-    </template>
-
-    <template is="dom-if" if="[[_isEmpty(_status)]]">
-      <div class="no-content">
-        <h2>No checks ran for this code review</h2>
-        <p>Configure checkers to view the results here.</p>
-      </div>
-    </template>
-
-    <template is="dom-if" if="[[_isNotConfigured(_status)]]">
-      <div class="no-content">
-        <h2>Code review checks not configured</h2>
-        <p>Configure checkers to view the results here.</p>
-      </div>
-    </template>
-
-    <template is="dom-if" if="[[_hasResults(_status)]]">
-      <header>
-        <h3>Latest checks for Patchset [[revision._number]]</h3>
-      </header>
-
-      <table>
-        <thead>
-          <tr class="headerRow">
-            <th class="topHeader"></th>
-            <th class="topHeader">Name</th>
-            <th class="topHeader">For submit</th>
-            <th class="topHeader">Status</th>
-            <th class="topHeader"><!--Checking system--></th>
-            <th class="topHeader">Started</th>
-            <th class="topHeader">Duration</th>
-            <th class="topHeader"><!-- actions --></th>
-            <th class="topHeader"><!-- re-run --></th>
-            <th class="topHeader">Description</th>
-          </tr>
-        </thead>
-        <tbody>
-          <template is="dom-repeat" items="[[_checks]]" as="check">
-            <tr>
-              <gr-checks-item on-retry-check="_handleRetryCheck" on-toggle-check-message="_toggleCheckMessage"
-                check="[[check]]">
-              </gr-checks-item>
-            </tr>
-            <template is="dom-if" if="[[check.showCheckMessage]]">
-              <tr>
-                <td colspan="10" class="check-message-heading">
-                  <span class="message-heading">
-                    Message
-                  </span>
-                </td>
-              </tr>
-              <tr>
-                <td colspan="10" class="check-message">
-                  <span class="message"> [[check.message]] </span>
-                </td>
-              </tr>
-            </template>
-          </template>
-        </tbody>
-      </table>
-    </template>
-
-    <gr-checkers-list on-resize="_handleCheckersListResize" plugin-rest-api="[[pluginRestApi]]"></gr-checkers-list>
-
-  </template>
-  <script src="gr-checks-view.js"></script>
-</dom-module>
diff --git a/gr-checks/gr-checks-view.js b/gr-checks/gr-checks-view.js
index fdd86e3..a398509 100644
--- a/gr-checks/gr-checks-view.js
+++ b/gr-checks/gr-checks-view.js
@@ -1,239 +1,411 @@
-(function() {
-  'use strict';
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import './gr-checkers-list.js';
+import './gr-checks-status.js';
+import './gr-checks-item.js';
 
-  const Defs = {};
+import {htmlTemplate} from './gr-checks-view_html.js';
+import {Statuses} from './gr-checks-all-statuses.js';
 
-  const Statuses = window.Gerrit.Checks.Statuses;
-  const StatusPriorityOrder = [
-    Statuses.FAILED,
-    Statuses.SCHEDULED,
-    Statuses.RUNNING,
-    Statuses.SUCCESSFUL,
-    Statuses.NOT_STARTED,
-    Statuses.NOT_RELEVANT,
-  ];
+const Defs = {};
 
-  const CHECKS_POLL_INTERVAL_MS = 60 * 1000;
+const StatusPriorityOrder = [
+  Statuses.FAILED,
+  Statuses.SCHEDULED,
+  Statuses.RUNNING,
+  Statuses.SUCCESSFUL,
+  Statuses.NOT_STARTED,
+  Statuses.NOT_RELEVANT,
+];
+
+const STATE_ALL = 'ALL';
+const CheckStateFilters = [STATE_ALL, ...StatusPriorityOrder];
+
+const CHECKS_POLL_INTERVAL_MS = 60 * 1000;
+const CHECKS_LIMIT = 20;
+
+/**
+ * @typedef {{
+ *   _number: number,
+ * }}
+ */
+Defs.Change;
+/**
+ * @typedef {{
+ *   _number: number,
+ * }}
+ */
+Defs.Revision;
+
+const LoadingStatus = {
+  LOADING: 0,
+  EMPTY: 1,
+  RESULTS: 2,
+  NOT_CONFIGURED: 3,
+};
+
+class GrChecksView extends Polymer.GestureEventListeners(
+    Polymer.LegacyElementMixin(
+        Polymer.Element)) {
+  /** @returns {string} name of the component */
+  static get is() { return 'gr-checks-view'; }
+
+  /** @returns {?} template for this component */
+  static get template() { return htmlTemplate; }
 
   /**
-   * @typedef {{
-   *   _number: number,
-   * }}
+   * Defines properties of the component
+   *
+   * @returns {?}
    */
-  Defs.Change;
-  /**
-   * @typedef {{
-   *   _number: number,
-   * }}
-   */
-  Defs.Revision;
-
-  const LoadingStatus = {
-    LOADING: 0,
-    EMPTY: 1,
-    RESULTS: 2,
-    NOT_CONFIGURED: 3,
-  };
-
-  Polymer({
-    is: 'gr-checks-view',
-
-    properties: {
-      revision: Object,
+  static get properties() {
+    return {
+      revision: {
+        type: Object,
+        observer: '_handleRevisionUpdate',
+      },
       change: Object,
       /** @type {function(number, number): !Promise<!Object>} */
       getChecks: Function,
-      /** @type {function(string): !Promise<Boolean>} */
+      /** @type {function(string): !Promise<boolean>} */
       isConfigured: Function,
       /** @type {function(string, string): !Promise<!Object>} */
       pluginRestApi: Object,
-      _checks: Object,
+      _checks: Array,
       _status: {
         type: Object,
         value: LoadingStatus.LOADING,
       },
+      _visibleChecks: {
+        type: Array,
+      },
+      _statuses: Array,
       pollChecksInterval: Number,
       visibilityChangeListenerAdded: {
         type: Boolean,
-        value: false
+        value: false,
       },
       _createCheckerCapability: {
         type: Boolean,
-        value: false
+        value: false,
       },
-    },
+      _patchSetDropdownItems: {
+        type: Array,
+        value() { return []; },
+        computed: '_computePatchSetDropdownItems(change)',
+      },
+      _currentPatchSet: {
+        type: Number,
+      },
+      _currentStatus: {
+        type: String,
+        value: STATE_ALL,
+      },
+      _showBlockingChecksOnly: {
+        type: Boolean,
+        value: false,
+      },
+      _showAllChecks: {
+        type: Boolean,
+        value: false,
+      },
+      _filteredChecks: Array,
+      _showMoreChecksButton: {
+        type: Boolean,
+        value: false,
+        notify: true,
+      },
+    };
+  }
 
-    observers: [
-      '_pollChecksRegularly(change, revision, getChecks)',
-    ],
+  static get observers() {
+    return [
+      '_pollChecksRegularly(change, _currentPatchSet, getChecks)',
+      '_updateVisibleChecks(_checks.*, _currentStatus, ' +
+          '_showBlockingChecksOnly, _showAllChecks)',
+      '_pluginReady(plugin)',
+    ];
+  }
 
-    attached() {
-      this.pluginRestApi = this.plugin.restApi();
-      this._initCreateCheckerCapability();
-    },
+  detached() {
+    super.detached();
+    clearInterval(this.pollChecksInterval);
+    this.unlisten(document, 'visibilitychange', '_onVisibililityChange');
+  }
 
-    detached() {
-      clearInterval(this.pollChecksInterval);
-      this.unlisten(document, 'visibilitychange', '_onVisibililityChange');
-    },
+  _pluginReady(plugin) {
+    this.pluginRestApi = plugin.restApi();
+    this._statuses = CheckStateFilters.map(state => {
+      return {
+        text: state,
+        value: state,
+      };
+    });
+    this._initCreateCheckerCapability();
+  }
 
-    _handleCheckersListResize() {
-      // Force polymer to recalculate position of overlay when length of
-      // checkers changes
-      this.$.listOverlay.refit();
-    },
+  _toggleShowChecks() {
+    this._showAllChecks = !this._showAllChecks;
+  }
 
-    _initCreateCheckerCapability() {
-      return this.pluginRestApi.getAccount().then(account => {
-        if (!account) { return; }
-        return this.pluginRestApi
+  _computePatchSetDropdownItems(change) {
+    return Object.values(change.revisions)
+        .filter(patch => patch._number !== 'edit')
+        .map(patch => {
+          return {
+            text: 'Patchset ' + patch._number,
+            value: patch._number,
+          };
+        })
+        .sort((a, b) => b.value - a.value);
+  }
+
+  _computeShowText(showAllChecks) {
+    return showAllChecks ? 'Show Less' : 'Show All';
+  }
+
+  _updateVisibleChecks(checksRecord, status, showBlockingChecksOnly,
+      showAllChecks) {
+    const checks = checksRecord.base;
+    if (!checks) return [];
+    this._filteredChecks = checks.filter(check => {
+      if (showBlockingChecksOnly && (!check.blocking ||
+            !check.blocking.length)) return false;
+      return status === STATE_ALL || check.state === status;
+    });
+    /* The showCheckMessage property is notified for change because the
+      changes to showCheckMessage are not reflected to the dom as the object
+      check has the same reference as before
+      If not notified, then the message for the check is not displayed after
+      clicking the toggle
+      */
+    this._showMoreChecksButton = this._filteredChecks.length > CHECKS_LIMIT;
+    this._visibleChecks = this._filteredChecks.slice(0, showAllChecks ?
+      undefined : CHECKS_LIMIT);
+    this._visibleChecks.forEach((val, idx) =>
+      this.notifyPath(`_visibleChecks.${idx}.showCheckMessage`));
+  }
+
+  _handleRevisionUpdate(revision) {
+    if (!revision) return;
+    this._currentPatchSet = revision._number;
+  }
+
+  _handlePatchSetChanged(e) {
+    // gr-dropdown-list returns value of type "String"
+    const patchSet = parseInt(e.detail.value);
+    if (patchSet === this._currentPatchSet) return;
+    this._currentPatchSet = patchSet;
+  }
+
+  _handleBlockingCheckboxClicked() {
+    this._showBlockingChecksOnly = !this._showBlockingChecksOnly;
+  }
+
+  _handleStatusFilterChanged(e) {
+    const status = e.detail.value;
+    if (status === this._currentStatus) return;
+    this._currentStatus = status;
+  }
+
+  _handleCheckersListResize() {
+    // Force polymer to recalculate position of overlay when length of
+    // checkers changes
+    this.$.listOverlay.refit();
+  }
+
+  _initCreateCheckerCapability() {
+    return this.pluginRestApi.getAccount().then(account => {
+      if (!account) { return; }
+      return this.pluginRestApi
           .getAccountCapabilities(['checks-administrateCheckers'])
           .then(capabilities => {
             if (capabilities['checks-administrateCheckers']) {
               this._createCheckerCapability = true;
             }
           });
-      });
-    },
+    });
+  }
 
-    _handleConfigureClicked() {
-      this.$$('gr-checkers-list')._showConfigureOverlay();
-    },
+  _handleConfigureClicked() {
+    this.$$('gr-checkers-list')._showConfigureOverlay();
+  }
 
-    _orderChecks(a, b) {
-      if (a.state != b.state) {
-        let indexA = StatusPriorityOrder.indexOf(a.state);
-        let indexB = StatusPriorityOrder.indexOf(b.state);
-        if (indexA != -1 && indexB != -1) {
-          return indexA - indexB;
-        }
-        return indexA == -1 ? 1 : -1;
+  _orderChecks(a, b) {
+    if (a.state != b.state) {
+      const indexA = StatusPriorityOrder.indexOf(a.state);
+      const indexB = StatusPriorityOrder.indexOf(b.state);
+      if (indexA != -1 && indexB != -1) {
+        return indexA - indexB;
       }
-      if (a.state === Statuses.FAILED) {
-        if (a.blocking && b.blocking && a.blocking.length !== b.blocking.length) {
-          return a.blocking.length == 0 ? 1 : -1;
-        }
+      return indexA == -1 ? 1 : -1;
+    }
+    if (a.state === Statuses.FAILED) {
+      if (a.blocking && b.blocking &&
+            a.blocking.length !== b.blocking.length) {
+        return a.blocking.length == 0 ? 1 : -1;
       }
-      return a.checker_name.localeCompare(b.checker_name);
-    },
+    }
+    return a.checker_name.localeCompare(b.checker_name);
+  }
 
-    _handleRetryCheck(e) {
-      const uuid = e.detail.uuid;
-      const retryCheck = (change, revision, uuid) => {
-        return this.pluginRestApi.post(
-          '/changes/' + change + '/revisions/' + revision + '/checks/' + uuid + '/rerun'
-        )
-      }
-      retryCheck(this.change._number, this.revision._number, uuid).then(
+  _handleRetryCheck(e) {
+    const uuid = e.detail.uuid;
+    const retryCheck = (change, revision, uuid) => this.pluginRestApi.post(
+        '/changes/' + change + '/revisions/' + revision + '/checks/' + uuid
+              + '/rerun'
+    );
+    retryCheck(this.change._number, this.revision._number, uuid).then(
         res => {
-          this._fetchChecks(this.change, this.revision, this.getChecks);
-        }, e => {
-          console.error(e);
+          this._fetchChecks(this.change, this.revision._number,
+              this.getChecks);
+        }, error => {
+          this.dispatchEvent(new CustomEvent('show-error',
+              {
+                detail: {message: error.message},
+                bubbles: true,
+                composed: true,
+              }));
         }
-      )
-    },
+    );
+  }
 
-
-    /**
-     * Merge new checks into old checks to maintain showCheckMessage
-     * property
-     * Loop over checks to make sure no new checks are missed
-     * Merge new check object into prev check
-     * Remove any check that is not returned the next time
-     * Ensure message is updated
-     */
-    _updateChecks(checks) {
-      return checks.map(
-        (check) => {
+  /**
+   * Explicity add showCheckMessage to maintain it
+   *
+   * Loop over checks to make sure no new checks are missed
+   * Remove any check that is not returned the next time
+   * Ensure message is updated
+   *
+   * @param {Array<Object>} checks
+   * @returns {Object}
+   */
+  _updateChecks(checks) {
+    return checks.map(
+        check => {
           const prevCheck = this._checks.find(
-            (c) => { return c.checker_uuid === check.checker_uuid }
-          )
+              c => c.checker_uuid === check.checker_uuid
+          );
           if (!prevCheck) return Object.assign({}, check);
-          return Object.assign({}, prevCheck, check,
-            {showCheckMessage: prevCheck.showCheckMessage});
+          return Object.assign({}, check,
+              {showCheckMessage: prevCheck.showCheckMessage});
         });
-    },
+  }
 
-    /**
-     * @param {!Defs.Change} change
-     * @param {!Defs.Revision} revision
-     * @param {function(number, number): !Promise<!Object>} getChecks
-     */
-    _fetchChecks(change, revision, getChecks) {
-      if (!getChecks || !change || !revision) return;
+  /**
+   * @param {!Defs.Change} change
+   * @param {!Defs.Revision} revisionNumber
+   * @param {function(number, number): !Promise<!Object>} getChecks
+   */
+  _fetchChecks(change, revisionNumber, getChecks) {
+    if (!getChecks || !change || !revisionNumber) return;
 
-      getChecks(change._number, revision._number).then(checks => {
-        if (checks && checks.length) {
-          checks.sort((a, b) => this._orderChecks(a, b));
-          if (!this._checks) {
-            this._checks = checks;
-          } else {
-            this._checks = this._updateChecks(checks);
-          }
-          this.set('_status', LoadingStatus.RESULTS);
+    getChecks(change._number, revisionNumber).then(checks => {
+      if (revisionNumber !== this._currentPatchSet) return;
+      if (checks && checks.length) {
+        checks.sort((a, b) => this._orderChecks(a, b));
+        if (!this._checks) {
+          this._checks = checks;
         } else {
-          this._checkConfigured();
+          this._checks = this._updateChecks(checks);
         }
-      });
-    },
+        this.set('_status', LoadingStatus.RESULTS);
+      } else {
+        this._checkConfigured();
+      }
+    }, error => {
+      this._checks = [];
+      this.set('_status', LoadingStatus.EMPTY);
+    });
+  }
 
-    _onVisibililityChange() {
-      if (document.hidden) {
-        clearInterval(this.pollChecksInterval);
-        return;
-      }
-      this._pollChecksRegularly(this.change, this.revision, this.getChecks);
-    },
+  _onVisibililityChange() {
+    if (document.hidden) {
+      clearInterval(this.pollChecksInterval);
+      return;
+    }
+    this._pollChecksRegularly(this.change, this._currentPatchSet,
+        this.getChecks);
+  }
 
-    _toggleCheckMessage(e) {
-      const uuid = e.detail.uuid;
-      if (!uuid) {
-        console.warn("uuid not found");
-        return;
-      }
-      const idx = this._checks.findIndex(check => check.checker_uuid === uuid);
-      if (idx == -1) {
-        console.warn("check not found");
-        return;
-      }
-      // Update subproperty of _checks[idx] so that it reflects to polymer
-      this.set(`_checks.${idx}.showCheckMessage`,
-        !this._checks[idx].showCheckMessage)
-    },
+  _toggleCheckMessage(e) {
+    const uuid = e.detail.uuid;
+    if (!uuid) {
+      console.warn('uuid not found');
+      return;
+    }
+    const idx = this._checks.findIndex(check => check.checker_uuid === uuid);
+    if (idx == -1) {
+      console.warn('check not found');
+      return;
+    }
+    // Update subproperty of _checks[idx] so that it reflects to polymer
+    this.set(`_checks.${idx}.showCheckMessage`,
+        !this._checks[idx].showCheckMessage);
+  }
 
-    _pollChecksRegularly(change, revision, getChecks) {
-      if (this.pollChecksInterval) {
-        clearInterval(this.pollChecksInterval);
-      }
-      const poll = () => this._fetchChecks(change, revision, getChecks);
-      poll();
-      this.pollChecksInterval = setInterval(poll, CHECKS_POLL_INTERVAL_MS)
-      if (!this.visibilityChangeListenerAdded) {
-        this.visibilityChangeListenerAdded = true;
-        this.listen(document, 'visibilitychange', '_onVisibililityChange');
-      }
-    },
+  _pollChecksRegularly(change, revisionNumber, getChecks) {
+    if (!change || !revisionNumber || !getChecks) return;
+    if (this.pollChecksInterval) {
+      clearInterval(this.pollChecksInterval);
+    }
+    const poll = () => this._fetchChecks(change, revisionNumber, getChecks);
+    poll();
+    this.pollChecksInterval = setInterval(poll, CHECKS_POLL_INTERVAL_MS);
+    if (!this.visibilityChangeListenerAdded) {
+      this.visibilityChangeListenerAdded = true;
+      this.listen(document, 'visibilitychange', '_onVisibililityChange');
+    }
+  }
 
-    _checkConfigured() {
-      const repository = this.change['project'];
-      this.isConfigured(repository).then(configured => {
-        const status =
+  _checkConfigured() {
+    const repository = this.change['project'];
+    this.isConfigured(repository).then(configured => {
+      const status =
             configured ? LoadingStatus.EMPTY : LoadingStatus.NOT_CONFIGURED;
-        this.set('_status', status);
-      });
-    },
+      this.set('_status', status);
+    });
+  }
 
-    _isLoading(status) {
-      return status === LoadingStatus.LOADING;
-    },
-    _isEmpty(status) {
-      return status === LoadingStatus.EMPTY;
-    },
-    _hasResults(status) {
-      return status === LoadingStatus.RESULTS;
-    },
-    _isNotConfigured(status) {
-      return status === LoadingStatus.NOT_CONFIGURED;
-    },
-  });
-})();
+  _isLoading(status) {
+    return status === LoadingStatus.LOADING;
+  }
+
+  _isEmpty(status) {
+    return status === LoadingStatus.EMPTY;
+  }
+
+  _hasResults(status) {
+    return status === LoadingStatus.RESULTS;
+  }
+
+  _isNotConfigured(status) {
+    return status === LoadingStatus.NOT_CONFIGURED;
+  }
+
+  _computeHeaderClass(currentPatchSet, sortedAllPatchsets) {
+    if (!sortedAllPatchsets
+         || sortedAllPatchsets.length < 1
+          || !currentPatchSet) {
+      return '';
+    }
+    return currentPatchSet === sortedAllPatchsets[0].value ?
+      '' : 'oldPatchset';
+  }
+}
+
+customElements.define(GrChecksView.is, GrChecksView);
\ No newline at end of file
diff --git a/gr-checks/gr-checks-view_html.js b/gr-checks/gr-checks-view_html.js
new file mode 100644
index 0000000..22af763
--- /dev/null
+++ b/gr-checks/gr-checks-view_html.js
@@ -0,0 +1,263 @@
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+export const htmlTemplate = Polymer.html`
+    <style>
+      :host {
+        display: block;
+        width: 100%;
+        overflow: auto;
+      }
+
+      table {
+        width: 100%;
+      }
+
+      gr-checks-item {
+        display: table-row;
+      }
+
+      gr-dropdown-list {
+        --trigger-style: {
+          color: var(--deemphasized-text-color);
+          text-transform: none;
+          font-family: var(--font-family);
+        }
+        --trigger-hover-color: rgba(0,0,0,.6);
+      }
+      @media screen and (max-width: 50em) {
+        gr-dropdown-list {
+          --native-select-style: {
+            max-width: 5.25em;
+          }
+          --dropdown-content-stype: {
+            max-width: 300px;
+          }
+        }
+      }
+
+      .headerRow {
+        border-bottom: 1px solid #ddd;
+      }
+
+      .topHeader {
+        padding-right: 32px;
+        padding-bottom: 4px;
+        text-align: left;
+        white-space: nowrap;
+      }
+
+      th.topHeader:last-child {
+        width: 100%;
+      }
+
+      h2 {
+        font-size: 1.17em;
+        font-weight: 500;
+      }
+
+      h3 {
+        flex: 1;
+        font-size: 1.17em;
+        font-weight: 500;
+        margin-bottom: 1.5rem;
+      }
+
+      header {
+        display: flex;
+        padding: var(--spacing-s) var(--spacing-m);
+      }
+
+      header.oldPatchset {
+        background: var(--emphasis-color);
+      }
+
+      table {
+        margin-bottom: 16px;
+      }
+
+      th:first-child {
+        padding-left: 1rem;
+      }
+
+      .no-content {
+        min-height: 106px;
+        padding: 24px 0;
+        text-align: center;
+      }
+
+      /* Add max-width 1px to check-message make sure content doesn't
+         expand beyond the table width */
+      .check-message {
+        padding-left: 1rem;
+        background: var(--table-subheader-background-color);
+        max-width: 1px;
+      }
+
+      .message {
+        white-space: pre-wrap;
+        word-wrap: break-word;
+      }
+
+      .message-heading {
+        font-weight: bold;
+        margin-top: 1em;
+      }
+
+      .check-message-heading {
+        padding-left: 1em;
+      }
+
+      .configure-button-container {
+        text-align: right;
+        flex: 1;
+      }
+
+      .filter {
+        margin-left: 10px;
+      }
+
+      #listOverlay {
+        width: 75%;
+      }
+
+      .container {
+        display: flex;
+        width: 100%;
+      }
+
+      .blocking-checks-container {
+        margin-left: 10px;
+        display: flex;
+        align-items: center;
+      }
+
+      .show-more-checks {
+        margin: 0 0 var(--spacing-l) var(--spacing-l);
+      }
+
+      .checks-table {
+        border-collapse: collapse;
+      }
+
+    </style>
+
+    <header class$="[[_computeHeaderClass(_currentPatchSet, _patchSetDropdownItems)]]">
+      <div class="container">
+        <template is="dom-if" if="[[_patchSetDropdownItems.length]]">
+          <gr-dropdown-list
+            class="patch-set-dropdown"
+            items="[[_patchSetDropdownItems]]"
+            on-value-change="_handlePatchSetChanged"
+            value="[[_currentPatchSet]]">
+          </gr-dropdown-list>
+        </template>
+        <template is="dom-if" if="[[_hasResults(_status)]]">
+          <div class="filter">
+            <span> Filter By: </span>
+            <gr-dropdown-list
+              class="check-state-filter"
+              items="[[_statuses]]"
+              on-value-change="_handleStatusFilterChanged"
+              value="[[_currentStatus]]">
+            </gr-dropdown-list>
+          </div>
+          <div class="blocking-checks-container">
+            <input type="checkbox"
+              name="blocking"
+              checked$="[[_showBlockingChecksOnly]]"
+              on-click="_handleBlockingCheckboxClicked"
+              value="blocking">
+              Required for Submit
+          </div>
+        </template>
+        <template is="dom-if" if="[[_createCheckerCapability]]">
+          <div class="configure-button-container">
+            <gr-button on-click="_handleConfigureClicked"> Configure </gr-button>
+          </div>
+        </template>
+      </div>
+    </header>
+
+    <template is="dom-if" if="[[_isLoading(_status)]]">
+      <div class="no-content">
+        <p>Loading...</p>
+      </div>
+    </template>
+
+    <template is="dom-if" if="[[_isEmpty(_status)]]">
+      <div class="no-content">
+        <h2>No checks ran for this code review</h2>
+        <p>Configure checkers to view the results here.</p>
+      </div>
+    </template>
+
+    <template is="dom-if" if="[[_isNotConfigured(_status)]]">
+      <div class="no-content">
+        <h2>Code review checks not configured</h2>
+        <p>Configure checkers to view the results here.</p>
+      </div>
+    </template>
+
+    <template is="dom-if" if="[[_hasResults(_status)]]">
+      <table class="checks-table">
+        <thead>
+          <tr class="headerRow">
+            <th class="topHeader"></th>
+            <th class="topHeader">Name</th>
+            <th class="topHeader">For submit</th>
+            <th class="topHeader">Status</th>
+            <th class="topHeader">Started</th>
+            <th class="topHeader">Duration</th>
+            <th class="topHeader"><!-- actions --></th>
+            <th class="topHeader"><!-- re-run --></th>
+            <th class="topHeader">Description</th>
+          </tr>
+        </thead>
+        <tbody>
+          <template is="dom-repeat" items="[[_visibleChecks]]" as="check">
+              <tr>
+                <gr-checks-item on-retry-check="_handleRetryCheck" on-toggle-check-message="_toggleCheckMessage"
+                  check="[[check]]">
+                </gr-checks-item>
+              </tr>
+              <template is="dom-if" if="[[check.showCheckMessage]]">
+                <tr>
+                  <td colspan="10" class="check-message-heading">
+                    <span class="message-heading">
+                      Message
+                    </span>
+                  </td>
+                </tr>
+                <tr>
+                  <td colspan="10" class="check-message">
+                    <span class="message"> [[check.message]] </span>
+                  </td>
+                </tr>
+              </template>
+          </template>
+        </tbody>
+      </table>
+      <template is="dom-if" if="[[_showMoreChecksButton]]">
+        <gr-button class="show-more-checks" on-click="_toggleShowChecks">
+          [[_computeShowText(_showAllChecks)]]
+        </gr-button>
+      </template>
+    </template>
+
+    <gr-checkers-list on-resize="_handleCheckersListResize" plugin-rest-api="[[pluginRestApi]]"></gr-checkers-list>
+    `;
\ No newline at end of file
diff --git a/gr-checks/gr-checks-view_test.html b/gr-checks/gr-checks-view_test.html
index 1f54281..beeac95 100644
--- a/gr-checks/gr-checks-view_test.html
+++ b/gr-checks/gr-checks-view_test.html
@@ -1,84 +1,100 @@
 <!DOCTYPE html>
 <meta name="viewport" content="width=device-width, minimum-scale=1.0, initial-scale=1.0, user-scalable=yes">
-<script src="../../../bower_components/webcomponentsjs/webcomponents-lite.min.js"></script>
-<script src="/bower_components/web-component-tester/browser.js"></script>
-
-<link rel="import" href="/bower_components/polymer/polymer.html">
+<script src="/node_modules/@webcomponents/webcomponentsjs/custom-elements-es5-adapter.js"></script>
+<script src="../node_modules/@webcomponents/webcomponentsjs/webcomponents-loader.js"></script>
+<script src="../bower_components/web-component-tester/browser.js"></script>
 
 <title>gr-checks-item</title>
-<link rel="import" href="gr-checks-view.html">
-
 
 <!-- Gr-overlay does not exist in the test framework
 It is expected to be provided by Gerrit core -->
-<dom-module id="gr-overlay">
-  <template>
-  </template>
-  <script>
-    Polymer({
-      is: 'gr-overlay',
-      refit() {}
-    });
-  </script>
-</dom-module>
+
+<script type="module">
+  import '../test/common-test-setup.js';
+
+  class GrOverlay extends Polymer.Element {
+    static get is() { return 'gr-overlay'; }
+
+    refit() {}
+
+    open() {}
+  }
+
+  customElements.define(GrOverlay.is, GrOverlay);
+</script>
 
 <test-fixture id="basic">
-  <template is="dom-template">
-    <gr-checks-view
-      change="[[change]]"
-      revision="[[revision]]"
-      get-checks="[[getChecks]]"
-      is-configured="[[isConfigured]]"
-      plugin="[[plugin]]"
-      retry-check="[[retryCheck]]">
-    </gr-checks-view>
+  <template>
+    <gr-checks-view></gr-checks-view>
   </template>
 </test-fixture>
 
-<script>
+<script type="module">
+  import './gr-checks-view.js';
+  import {Statuses} from './gr-checks-all-statuses.js';
+
   const CHECK1 = {
     checkId: 'test-check-id',
     logUrl: 'http://example.com/test-log-url',
-    startTime: "2019-02-06T22:25:19.269Z",
-    finishTime: "2019-02-06T22:25:44.574Z",
-    checker_name: "test checker",
-    state: "RUNNING",
-    checker_status: "ENABLED",
+    startTime: '2019-02-06T22:25:19.269Z',
+    finishTime: '2019-02-06T22:25:44.574Z',
+    checker_name: 'test checker',
+    state: 'RUNNING',
+    checker_status: 'ENABLED',
     blocking: [],
-    checker_description: "No-op jobs for testing purposes",
-    message: "added test file\n\nChange-Id: I8df212a28ae23cc239afd10ee4f506887e03ab70\n",
+    checker_description: 'No-op jobs for testing purposes',
+    message: '\n\nChange-Id: I8df212a28ae23cc239afd10ee4f506887e03ab70\n',
     showCheckMessage: undefined,
-    checker_uuid: "gerritforge:codestyle-a6a0e4682515f3521897c5f950d1394f4619d928",
+    checker_uuid: 'codestyle-a6a0e4682515f3521897c5f950d1394f4619d928',
   };
   const CHECK2 = {
     checkId: 'test-check-id2',
     logUrl: 'http://example.com/test-log-url',
-    startTime: "2019-02-06T22:25:19.269Z",
-    finishTime: "2019-02-06T22:25:44.574Z",
-    checker_name: "test checker2",
-    state: "RUNNING",
-    checker_status: "ENABLED",
+    startTime: '2019-02-06T22:25:19.269Z',
+    finishTime: '2019-02-06T22:25:44.574Z',
+    checker_name: 'test checker2',
+    state: 'RUNNING',
+    checker_status: 'ENABLED',
     blocking: [],
-    checker_description: "No-op jobs for testing purposes 2",
-    message: "added test file\n\nChange-Id: I8df212a28ae23cc239afd10ee4f506887e03ab70\n",
+    checker_description: 'No-op jobs for testing purposes 2',
+    message: '\n\nChange-Id: I8df212a28ae23cc239afd10ee4f506887e03ab70\n',
     showCheckMessage: undefined,
-    checker_uuid: "gerritforge:polygerrit-a6a0e4682515f3521897c5f950d1394f4619d928",
+    checker_uuid: 'polygerrit-a6a0e4682515f3521897c5f950d1394f4619d928',
   };
   const REVISION = {
-    "kind": "REWORK",
-    "_number": 3,
-    "created": "2018-05-15 21:56:13.000000000",
-    "uploader": {
-      "_account_id": 1000000,
+    kind: 'REWORK',
+    _number: 3,
+    created: '2018-05-15 21:56:13.000000000',
+    uploader: {
+      _account_id: 1000000,
     },
-    "ref": "refs/changes/00/1000/1",
-    "commit": {
-      "parents": [],
-      "subject": "added test file",
-      "message": "added test file\n\nChange-Id: I8df212a28ae23cc239afd10ee4f506887e03ab70\n",
-      "commit": "1c9a1dfd38ea51dc7880f3ddf669100710f0c91b"
+    ref: 'refs/changes/00/1000/1',
+    commit: {
+      parents: [],
+      subject: '',
+      message: '\n\nChange-Id: I8df212a28ae23cc239afd10ee4f506887e03ab70\n',
+      commit: '1c9a1dfd38ea51dc7880f3ddf669100710f0c91b',
     },
   };
+  const REVISION2 = {
+    kind: 'REWORK',
+    _number: 2,
+    created: '2018-05-15 21:56:13.000000000',
+    uploader: {
+      _account_id: 1000000,
+    },
+    ref: 'refs/changes/00/1000/2',
+    commit: {
+      parents: [],
+      subject: '',
+      message: '\n\nChange-Id: I8df212a28ae23cc239afd10ee4f506887e03ab70\n',
+      commit: '1c9a1dfd38ea51dc6880f3ddf669100710f0c91b',
+    },
+  };
+
+  const CHECKS_POLL_INTERVAL_MS = 60 * 1000;
+  const STATE_ALL = 'ALL';
+  const CHECKS_LIMIT = 20;
 
   suite('gr-checks-view tests', () => {
     let element;
@@ -88,12 +104,14 @@
     let retryCheckSpy;
     let isConfiguredSpy;
     let isConfiguredResolve;
-    let getAccountSpy, getAccountPromise, getAccountResolve;
-    let fetchJSONSpy, fetchJSONPromise, fetchJSONResolve;
-    let getAccountCapabilitiesSpy, getAccountCapabilitiesPromise,
-      getAccountCapabilitiesResolve;
-
-    setup((done) => {
+    let getAccountSpy;
+    let getAccountResolve;
+    let fetchJSONSpy;
+    let getAccountCapabilitiesSpy;
+    let getAccountCapabilitiesResolve;
+    let postSpy;
+    let postReject;
+    setup(done => {
       sandbox = sinon.sandbox.create();
 
       getChecksSpy = sinon.stub();
@@ -115,39 +133,45 @@
       getAccountSpy = sinon.stub();
       const getAccountPromise = new Promise((resolve, reject) => {
         getAccountResolve = resolve;
-      })
+      });
       getAccountSpy.returns(getAccountPromise);
 
+      postSpy = sinon.stub();
+      const postPromise = new Promise((resolve, reject) => {
+        postReject = reject;
+      });
+      postSpy.returns(postPromise);
+
       fetchJSONSpy = sinon.stub();
-      const fetchJSONPromise = new Promise((resolve, reject) => {
-        fetchJSONResolve = resolve;
-      })
-      fetchJSONSpy.returns(fetchJSONPromise)
+      const fetchJSONPromise = new Promise(() => {});
+      fetchJSONSpy.returns(fetchJSONPromise);
 
       getAccountCapabilitiesSpy = sinon.stub();
       const getAccountCapabilitiesPromise = new Promise((resolve, reject) => {
         getAccountCapabilitiesResolve = resolve;
-      })
+      });
       getAccountCapabilitiesSpy.returns(getAccountCapabilitiesPromise);
 
       plugin.restApi = () => ({
         getAccount: getAccountSpy,
         fetchJSON: fetchJSONSpy,
-        getAccountCapabilities: getAccountCapabilitiesSpy
+        getAccountCapabilities: getAccountCapabilitiesSpy,
+        post: postSpy,
       });
-      element = fixture('basic', {
+      element = fixture('basic');
+      Object.assign(element, {
         retryCheck: retryCheckSpy,
         getChecks: getChecksSpy,
         isConfigured: isConfiguredSpy,
         change: {
-          'project': 'test-repository',
-          '_number': 2,
-          'revisions': {
-            'first-sha': "test-revision",
+          project: 'test-repository',
+          _number: 2,
+          revisions: {
+            'first-sha': REVISION2,
             'second-sha': REVISION,
           },
         },
-        plugin: plugin,
+        plugin,
         revision: REVISION,
       });
       flush(done);
@@ -157,7 +181,7 @@
 
     test('renders loading', () => {
       // Element also contains the hidden gr-overlay hence use includes
-      assert(element.textContent.trim().includes('Loading...'));
+      assert(element.shadowRoot.textContent.trim().includes('Loading...'));
     });
 
     test('queries the checks', () => {
@@ -166,7 +190,7 @@
     });
 
     suite('no checks returned', () => {
-      setup((done) => {
+      setup(done => {
         getChecksResolve([]);
         flush(done);
       });
@@ -181,29 +205,31 @@
       });
 
       suite('not configured', () => {
-        setup((done) => {
+        setup(done => {
           isConfiguredResolve(false);
           flush(done);
         });
 
         test('renders checks not configured', () => {
           const header = element.$$('h2');
-          assert.equal(header.textContent.trim(), 'Code review checks not configured');
+          assert.equal(header.textContent.trim(),
+              'Code review checks not configured');
         });
 
         suite('create checker capability false', () => {
-          setup((done) => {
+          setup(done => {
             getAccountResolve(true);
             getAccountCapabilitiesResolve({'checks-administrateCheckers': false});
             flush(done);
           });
+
           test('checker button does not render', () => {
             assert(!element.$$('gr-button'));
           });
         });
 
         suite('create checker capability true', () => {
-          setup((done) => {
+          setup(done => {
             getAccountResolve(true);
             getAccountCapabilitiesResolve({'checks-administrateCheckers': true});
             flush(done);
@@ -212,24 +238,24 @@
             assert(element.$$('gr-button'));
           });
         });
-
       });
 
       suite('no checks ran', () => {
-        setup((done) => {
+        setup(done => {
           isConfiguredResolve(true);
           flush(done);
         });
 
         test('renders checks not configured', () => {
-          const header = element.$$('h2');
-          assert.equal(header.textContent.trim(), 'No checks ran for this code review');
+          const header = element.shadowRoot.querySelector('h2');
+          assert.equal(header.textContent.trim(),
+              'No checks ran for this code review');
         });
       });
     });
 
     suite('checks updated properly', () => {
-      setup((done) => {
+      setup(done => {
         element._checks = [CHECK1, CHECK2];
         flush(done);
       });
@@ -237,12 +263,12 @@
       test('message is updated', () => {
         const NEW_CHECKS = [Object.assign({}, CHECK1),
           Object.assign({}, CHECK2)];
-        NEW_CHECKS[0].message = "New message 1";
-        NEW_CHECKS[1].message = "New message 2";
+        NEW_CHECKS[0].message = 'New message 1';
+        NEW_CHECKS[1].message = 'New message 2';
         const EXPECTED_CHECKS = [Object.assign({}, CHECK1),
           Object.assign({}, CHECK2)];
-        EXPECTED_CHECKS[0].message = "New message 1";
-        EXPECTED_CHECKS[1].message = "New message 2";
+        EXPECTED_CHECKS[0].message = 'New message 1';
+        EXPECTED_CHECKS[1].message = 'New message 2';
         const UPDATED_CHECKS = element._updateChecks(NEW_CHECKS);
         assert.equal(UPDATED_CHECKS[0].message, NEW_CHECKS[0].message);
         assert.equal(UPDATED_CHECKS[1].message, NEW_CHECKS[1].message);
@@ -259,14 +285,13 @@
       test('status is updated', () => {
         const NEW_CHECKS = [Object.assign({}, CHECK1),
           Object.assign({}, CHECK2)];
-        NEW_CHECKS[0].state = "SUCCESSFUL";
-        NEW_CHECKS[1].state = "FAILED";
+        NEW_CHECKS[0].state = 'SUCCESSFUL';
+        NEW_CHECKS[1].state = 'FAILED';
         const UPDATED_CHECKS = element._updateChecks(NEW_CHECKS);
         assert.deepEqual(UPDATED_CHECKS, NEW_CHECKS);
       });
 
       test('showMessage property is retained', () => {
-
         element._checks[0].showCheckMessage = true;
         element._checks[1].showCheckMessage = false;
 
@@ -274,13 +299,32 @@
           Object.assign({}, CHECK2)];
         const UPDATED_CHECKS = element._updateChecks(NEW_CHECKS);
         assert.equal(UPDATED_CHECKS[0].showCheckMessage,
-          CHECK1.showCheckMessage);
+            CHECK1.showCheckMessage);
         assert.equal(UPDATED_CHECKS[1].showCheckMessage,
-          CHECK2.showCheckMessage);
+            CHECK2.showCheckMessage);
 
         element._checks[0].showCheckMessage = undefined;
         element._checks[1].showCheckMessage = undefined;
+      });
 
+      test('url is not set if new check has no url', () => {
+        const NEW_CHECKS = [Object.assign({}, CHECK1),
+          Object.assign({}, CHECK2)];
+        delete NEW_CHECKS[0]['url'];
+        delete NEW_CHECKS[1]['url'];
+        const UPDATED_CHECKS = element._updateChecks(NEW_CHECKS);
+        assert.isNotOk(UPDATED_CHECKS[0].url);
+        assert.isNotOk(UPDATED_CHECKS[1].url);
+      });
+
+      test('url is not set if new check has no url', () => {
+        const NEW_CHECKS = [Object.assign({}, CHECK1),
+          Object.assign({}, CHECK2)];
+        delete NEW_CHECKS[0]['url'];
+        delete NEW_CHECKS[1]['url'];
+        const UPDATED_CHECKS = element._updateChecks(NEW_CHECKS);
+        assert.isNotOk(UPDATED_CHECKS[0].url);
+        assert.isNotOk(UPDATED_CHECKS[1].url);
       });
 
       test('message is not shown if new check has no message', () => {
@@ -290,12 +334,14 @@
         const UPDATED_CHECKS = element._updateChecks(NEW_CHECKS);
         assert.equal(UPDATED_CHECKS[0].message, NEW_CHECKS[0].message);
       });
-
     });
 
     suite('with checks', () => {
       setup(done => {
-        getChecksResolve([CHECK1, CHECK1, CHECK1]);
+        const CHECK3 = Object.assign({}, CHECK1, {state: 'FAILED'});
+        const CHECK4 = Object.assign({}, CHECK1, {state: 'FAILED',
+          blocking: [1, 2, 3]});
+        getChecksResolve([CHECK1, CHECK2, CHECK3, CHECK4]);
         flush(done);
       });
 
@@ -303,18 +349,60 @@
         assert.isFalse(isConfiguredSpy.called);
       });
 
-      test('renders the header', () => {
-        const header = element.$$('header > h3');
-        assert.equal(header.textContent.trim(), 'Latest checks for Patchset 3');
-      });
-
       test('renders a table of all the checks', () => {
         const tbody = element.$$('table > tbody');
-        assert.lengthOf(tbody.querySelectorAll('gr-checks-item'), 3)
+        assert.lengthOf(tbody.querySelectorAll('gr-checks-item'), 4);
+      });
+
+      test('retry fires show-error event', done => {
+        postReject(new Error('random error'));
+        const fireStub = sandbox.stub(element, 'dispatchEvent');
+        Polymer.dom.flush();
+        const checksItem = element.shadowRoot.querySelectorAll(
+            'table > tbody > gr-checks-item'
+        )[0];
+        const reRun = checksItem.shadowRoot.querySelectorAll('td')[7];
+        const reRunButton = reRun.querySelector('gr-button');
+        reRunButton.click();
+        flush(() => {
+          assert.equal(fireStub.firstCall.args[0].type, ('show-error'));
+          done();
+        });
+      });
+
+      suite('message is rendered', () => {
+        setup(done => {
+          element._checks = [CHECK1, CHECK2];
+          flush(done);
+        });
+
+        test('messsage icon is displayed', () => {
+          const checkItems = element.shadowRoot
+              .querySelectorAll('gr-checks-item');
+          const messagesCount = [...checkItems].reduce((count, item) => {
+            return count += item.shadowRoot
+                .querySelectorAll('.expand-message').length;
+          }, 0);
+          assert.equal(messagesCount,
+              element._visibleChecks.length);
+        });
+
+        test('message displayed on clicking icon', done => {
+          const checkItem = element.shadowRoot.querySelector('gr-checks-item');
+          checkItem.shadowRoot
+              .querySelector('.expand-message').click();
+          flush(() => {
+            const msg = element.shadowRoot
+                .querySelector('.check-message').innerText
+                .trim();
+            assert.equal(msg, element._visibleChecks[0].message.trim());
+            done();
+          });
+        });
       });
 
       suite('create checker capability false', () => {
-        setup((done) => {
+        setup(done => {
           getAccountResolve(true);
           getAccountCapabilitiesResolve({'checks-administrateCheckers': false});
           flush(done);
@@ -324,17 +412,147 @@
         });
       });
 
+      test('retry checks', done => {
+        const checkItems = element.shadowRoot
+            .querySelectorAll('gr-checks-item');
+        const retryButton = checkItems[0].shadowRoot
+            .querySelectorAll('gr-button')[1];
+        MockInteractions.tap(retryButton);
+        const expectedUrl = '/changes/2/revisions/3/checks/codestyle-'
+          + 'a6a0e4682515f3521897c5f950d1394f4619d928/rerun';
+        flush(() => {
+          assert.isTrue(postSpy.calledWith(expectedUrl));
+          done();
+        });
+      });
+
       suite('create checker capability true', () => {
-        setup((done) => {
+        setup(done => {
           getAccountResolve(true);
-          getAccountCapabilitiesResolve({'checks-administrateCheckers': true});
+          getAccountCapabilitiesResolve({
+            'checks-administrateCheckers': true,
+          });
           flush(done);
         });
+
         test('checker button renders', () => {
           assert(element.$$('gr-button'));
         });
       });
 
+      suite('patchset navigation', () => {
+        test('renders the dropdown', () => {
+          assert.isNotNull(element.shadowRoot
+              .querySelector('.patch-set-dropdown'));
+        });
+
+        test('when patchset updated it fetches new checks', done => {
+          const clock = sinon.useFakeTimers();
+          const fetchChecksStub = sandbox.stub(element,
+              '_fetchChecks');
+          assert.equal(element._currentPatchSet, 3);
+          element.revision = REVISION2;
+          flush(() => {
+            const firstCallArgs = fetchChecksStub.args[0];
+            assert.equal(firstCallArgs[1], element._currentPatchSet);
+            clock.tick(CHECKS_POLL_INTERVAL_MS + 1000);
+            flush(() => {
+              assert(fetchChecksStub.callCount === 2);
+              const secondCallArgs = fetchChecksStub.args[1];
+              assert.equal(secondCallArgs[1], element._currentPatchSet);
+              done();
+            });
+          });
+        });
+
+        test('update to revision updates currentPatchset', done => {
+          assert.equal(element._currentPatchSet, 3);
+          element.revision = REVISION2;
+          flush(() => {
+            assert.equal(element._currentPatchSet, 2);
+            done();
+          });
+        });
+      });
+
+      suite('check state filter', () => {
+        test('renders the filter dropdown', () => {
+          assert.isNotNull(element.shadowRoot
+              .querySelector('.check-state-filter'));
+        });
+
+        test('default filter is all', () => {
+          assert.equal(element._currentStatus, STATE_ALL);
+        });
+
+        test('updating filter status filters checks', done => {
+          assert.equal(element._visibleChecks.length, 4);
+          element._currentStatus = Statuses.RUNNING;
+          flush(() => {
+            assert.equal(element._visibleChecks.length, 2);
+            done();
+          });
+        });
+      });
+
+      suite('blocking checkbox', () => {
+        test('renders the checkbox', () => {
+          assert.isNotNull(element.shadowRoot
+              .querySelector('input[name="blocking"]'));
+        });
+
+        test('default filter is all', () => {
+          assert.equal(element.shadowRoot
+              .querySelector('input[name="blocking"]').checked,
+          false);
+        });
+
+        test('blocking checkbox filters checks', done => {
+          assert.equal(element._visibleChecks.length, 4);
+          element.shadowRoot.querySelector('input[name="blocking"]').click();
+          flush(() => {
+            assert.equal(element._visibleChecks.length, 1);
+            done();
+          });
+        });
+      });
+    });
+
+    suite('with large number of checks', () => {
+      setup(done => {
+        const CHECK3 = Object.assign({}, CHECK1, {state: 'FAILED'});
+        const CHECK4 = Object.assign({}, CHECK1, {state: 'FAILED',
+          blocking: [1, 2, 3]});
+        const checks = [];
+        for (let i = 1; i <= 20; i++) {
+          checks.push(...[CHECK1, CHECK2, CHECK3, CHECK4]);
+        }
+        getChecksResolve(checks);
+        flush(done);
+      });
+
+      test('rendered checks are limited by default', () => {
+        assert.equal(element._visibleChecks.length, CHECKS_LIMIT);
+      });
+
+      test('show more button expands to show all checks', () => {
+        const showMoreChecksButton = element.shadowRoot
+            .querySelector('.show-more-checks');
+        assert.isOk(showMoreChecksButton);
+        showMoreChecksButton.click();
+        flush(() => {
+          assert.equal(element._visibleChecks.length, element._checks.length);
+        });
+      });
+
+      test('show more button hides if checks are below limit', () => {
+        element._currentStatus = Statuses.NOT_STARTED;
+        flush(() => {
+          const showMoreChecksButton = element.querySelector(
+              '.show-more-checks');
+          assert.equal(showMoreChecksButton.style.display, 'none');
+        });
+      });
     });
   });
 
diff --git a/gr-checks/gr-checks.html b/gr-checks/gr-checks.html
deleted file mode 100644
index ceed087..0000000
--- a/gr-checks/gr-checks.html
+++ /dev/null
@@ -1,46 +0,0 @@
-<link rel="import" href="gr-checks-view.html">
-<link rel="import" href="gr-checks-item.html">
-<link rel="import" href="gr-checks-status.html">
-<link rel="import" href="gr-checks-chip-view.html">
-<link rel="import" href="gr-checks-change-list-item-cell-view.html">
-<link rel="import" href="gr-checks-change-list-header-view.html">
-<link rel="import" href="gr-checks-change-view-tab-header-view.html">
-
-<dom-module id="gr-checks">
-  <script>
-    Gerrit.install(plugin => {
-
-      const getChecks = (change, revision) => {
-        return plugin.restApi().get(
-          '/changes/' + change + '/revisions/' + revision + '/checks?o=CHECKER');
-      };
-
-      // TODO(brohlfs): Enable this dashboard column when search queries start
-      // returning checks.
-      // plugin.registerDynamicCustomComponent(
-      //     'change-list-header',
-      //     'gr-checks-change-list-header-view');
-      // plugin.registerDynamicCustomComponent(
-      //     'change-list-item-cell',
-      //     'gr-checks-change-list-item-cell-view');
-      plugin.registerCustomComponent(
-        'commit-container',
-        'gr-checks-chip-view').onAttached(
-        view => {
-          view['getChecks'] = getChecks;
-        }
-      );
-      plugin.registerDynamicCustomComponent(
-        'change-view-tab-header',
-        'gr-checks-change-view-tab-header-view'
-      );
-      plugin.registerDynamicCustomComponent(
-        'change-view-tab-content',
-        'gr-checks-view').onAttached(
-        view => {
-          view['isConfigured'] = (repository) => Promise.resolve(true);
-          view['getChecks'] = getChecks;
-        });
-      });
-  </script>
-</dom-module>
diff --git a/gr-checks/gr-checks.js b/gr-checks/gr-checks.js
new file mode 100644
index 0000000..b8c2920
--- /dev/null
+++ b/gr-checks/gr-checks.js
@@ -0,0 +1,57 @@
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import './gr-checks-chip-view.js';
+import './gr-checks-view.js';
+import './gr-checks-change-view-tab-header-view.js';
+import './gr-checks-change-list-header-view.js';
+import './gr-checks-change-list-item-cell-view.js';
+import './gr-checks-item.js';
+import './gr-checks-status.js';
+
+Gerrit.install(plugin => {
+  const getChecks = (change, revision) => {
+    return plugin.restApi().get(
+        '/changes/' + change + '/revisions/' + revision + '/checks?o=CHECKER');
+  };
+
+  // TODO(brohlfs): Enable this dashboard column when search queries start
+  // returning checks.
+  // plugin.registerDynamicCustomComponent(
+  //     'change-list-header',
+  //     'gr-checks-change-list-header-viewgg');
+  // plugin.registerDynamicCustomComponent(
+  //     'change-list-item-cell',
+  //     'gr-checks-change-list-item-cell-view');
+  plugin.registerCustomComponent(
+      'commit-container',
+      'gr-checks-chip-view').onAttached(
+      view => {
+        view['getChecks'] = getChecks;
+      }
+  );
+  plugin.registerDynamicCustomComponent(
+      'change-view-tab-header',
+      'gr-checks-change-view-tab-header-view'
+  );
+  plugin.registerDynamicCustomComponent(
+      'change-view-tab-content',
+      'gr-checks-view').onAttached(
+      view => {
+        view['isConfigured'] = repository => Promise.resolve(true);
+        view['getChecks'] = getChecks;
+      });
+});
\ No newline at end of file
diff --git a/gr-checks/gr-create-checkers-dialog.js b/gr-checks/gr-create-checkers-dialog.js
index 2c0dd25..ace3e77 100644
--- a/gr-checks/gr-create-checkers-dialog.js
+++ b/gr-checks/gr-create-checkers-dialog.js
@@ -1,24 +1,58 @@
-(function() {
-  'use strict';
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import './gr-repo-chip.js';
+import {htmlTemplate} from './gr-create-checkers-dialog_html.js';
 
-  const REPOS_PER_PAGE = 6;
-  const CREATE_CHECKER_URL = '/plugins/checks/checkers/';
-  const SCHEME_PATTERN = /^[\w-_.]*$/;
+const REPOS_PER_PAGE = 6;
+const CREATE_CHECKER_URL = '/plugins/checks/checkers/';
+const SCHEME_PATTERN = /^[\w-_.]*$/;
 
-  Polymer({
-    is: 'gr-create-checkers-dialog',
+class GrCreateCheckersDialog extends Polymer.GestureEventListeners(
+    Polymer.LegacyElementMixin(
+        Polymer.Element)) {
+  /** @returns {string} name of the component */
+  static get is() { return 'gr-create-checkers-dialog'; }
 
-    properties: {
+  /** @returns {?} template for this component */
+  static get template() { return htmlTemplate; }
+
+  /**
+   * Fired when the cancel button is pressed.
+   *
+   * @event cancel
+   */
+
+  /**
+   * Defines properties of the component
+   *
+   * @returns {?}
+   */
+  static get properties() {
+    return {
       checker: {
         type: Object,
-        observer: '_checkerChanged'
+        observer: '_checkerChanged',
       },
       _name: String,
       _scheme: String,
       _id: String,
       _uuid: {
         type: String,
-        value: ""
+        value: '',
       },
       pluginRestApi: Object,
       _url: String,
@@ -26,8 +60,8 @@
       _getRepoSuggestions: {
         type: Function,
         value() {
-          return this._repoSuggestions.bind(this)
-        }
+          return this._repoSuggestions.bind(this);
+        },
       },
       // The backend might support multiple repos in the future
       // which is why I decided to keep it as an array.
@@ -38,220 +72,227 @@
       },
       _repositorySelected: {
         type: Boolean,
-        value: false
+        value: false,
       },
       _handleOnRemove: Function,
       _errorMsg: {
         type: String,
-        value: ''
+        value: '',
       },
       _statuses: {
         type: Array,
         value: [
           {
-            "text": "ENABLED",
-            "value": "ENABLED"
+            text: 'ENABLED',
+            value: 'ENABLED',
           },
           {
-            "text": "DISABLED",
-            "value": "DISABLED"
-          }
+            text: 'DISABLED',
+            value: 'DISABLED',
+          },
         ],
-        readOnly: true
+        readOnly: true,
       },
       _required: {
         type: Boolean,
-        value: false
+        value: false,
       },
       _status: String,
       _edit: {
         type: Boolean,
-        value: false
+        value: false,
       },
-      _query: String
-    },
+      _query: String,
+    };
+  }
 
-    behaviours: [
-      Gerrit.FireBehavior,
-    ],
-    /**
-    * Fired when the cancel button is pressed.
-    *
-    * @event cancel
-    */
-
-
-    observers: [
+  static get observers() {
+    return [
       '_updateUUID(_scheme, _id)',
-    ],
+    ];
+  }
 
-    _checkerChanged() {
-      if (!this.checker) {
-        console.warn("checker not set");
-        return;
-      }
-      this._edit = true;
-      this._scheme = this.checker.uuid.split(':')[0];
-      this._id = this.checker.uuid.split(':')[1];
-      this._name = this.checker.name;
-      this._description = this.checker.description || '';
-      this._url = this.checker.url || '';
-      this._query = this.checker.query || '';
-      this._required = this.checker.blocking &&
+  _checkerChanged() {
+    if (!this.checker) {
+      console.warn('checker not set');
+      return;
+    }
+    this._edit = true;
+    this._scheme = this.checker.uuid.split(':')[0];
+    this._id = this.checker.uuid.split(':')[1];
+    this._name = this.checker.name;
+    this._description = this.checker.description || '';
+    this._url = this.checker.url || '';
+    this._query = this.checker.query || '';
+    this._required = this.checker.blocking &&
                         this.checker.blocking.length > 0;
-      if (this.checker.repository) {
-        this._repositorySelected = true;
-        this.set('_repos', [{name: this.checker.repository}]);
-      }
-      this._status = this.checker.status;
-    },
+    if (this.checker.repository) {
+      this._repositorySelected = true;
+      this.set('_repos', [{name: this.checker.repository}]);
+    }
+    this._status = this.checker.status;
+  }
 
-    _updateUUID(_scheme, _id) {
-      this._uuid = _scheme + ":" + _id;
-    },
+  _updateUUID(_scheme, _id) {
+    this._uuid = _scheme + ':' + _id;
+  }
 
-    _handleStatusChange(e) {
-      this._status = e.detail.value;
-    },
+  _handleStatusChange(e) {
+    this._status = e.detail.value;
+  }
 
-    _validateRequest() {
-      if (!this._name) {
-        this._errorMsg = 'Name cannot be empty';
-        return false;
-      }
-      if (this._description && this._description.length > 1000) {
-        this._errorMsg = 'Description should be less than 1000 characters';
-        return false;
-      }
-      if (!this._repositorySelected) {
-        this._errorMsg = 'Select a repository';
-        return false;
-      }
-      if (!this._scheme) {
-        this._errorMsg = 'Scheme cannot be empty.';
-        return false;
-      }
-      if (this._scheme.match(SCHEME_PATTERN) == null) {
-        this._errorMsg =
+  _validateRequest() {
+    if (!this._name) {
+      this._errorMsg = 'Name cannot be empty';
+      return false;
+    }
+    if (this._description && this._description.length > 1000) {
+      this._errorMsg = 'Description should be less than 1000 characters';
+      return false;
+    }
+    if (!this._repositorySelected) {
+      this._errorMsg = 'Select a repository';
+      return false;
+    }
+    if (!this._scheme) {
+      this._errorMsg = 'Scheme cannot be empty.';
+      return false;
+    }
+    if (this._scheme.match(SCHEME_PATTERN) == null) {
+      this._errorMsg =
           'Scheme must contain [A-Z], [a-z], [0-9] or {"-" , "_" , "."}';
-        return false;
-      }
-      if (this._scheme.length > 100) {
-        this._errorMsg = 'Scheme must be shorter than 100 characters';
-        return false;
-      }
-      if (!this._id) {
-        this._errorMsg = 'ID cannot be empty.';
-        return false;
-      }
-      if (this._id.match(SCHEME_PATTERN) == null) {
-        this._errorMsg =
+      return false;
+    }
+    if (this._scheme.length > 100) {
+      this._errorMsg = 'Scheme must be shorter than 100 characters';
+      return false;
+    }
+    if (!this._id) {
+      this._errorMsg = 'ID cannot be empty.';
+      return false;
+    }
+    if (this._id.match(SCHEME_PATTERN) == null) {
+      this._errorMsg =
           'ID must contain [A-Z], [a-z], [0-9] or {"-" , "_" , "."}';
-        return false;
-      }
-      return true;
-    },
+      return false;
+    }
+    return true;
+  }
 
-    // TODO(dhruvsri): make sure dialog is scrollable.
+  // TODO(dhruvsri): make sure dialog is scrollable.
 
-    _createChecker(checker) {
-      return this.pluginRestApi.send(
+  _createChecker(checker) {
+    return this.pluginRestApi.send(
         'POST',
         CREATE_CHECKER_URL,
-        checker,
-      )
-    },
+        checker
+    );
+  }
 
-    _editChecker(checker) {
-      const url = CREATE_CHECKER_URL + checker.uuid;
-      return this.pluginRestApi.send(
+  _editChecker(checker) {
+    const url = CREATE_CHECKER_URL + checker.uuid;
+    return this.pluginRestApi.send(
         'POST',
         url,
         checker
-      )
-    },
+    );
+  }
 
-    handleEditChecker() {
-      if (!this._validateRequest()) return;
-      this._editChecker(this._getCheckerRequestObject()).then(
+  handleEditChecker() {
+    if (!this._validateRequest()) return;
+    this._editChecker(this._getCheckerRequestObject()).then(
         res => {
           if (res) {
             this._errorMsg = '';
-            this.fire('cancel', {reload: true}, {bubbles: true});
+            this.dispatchEvent(new CustomEvent('cancel',
+                {
+                  detail: {reload: true},
+                  bubbles: true,
+                  composed: true,
+                }
+            ));
           }
         },
         error => {
           this._errorMsg = error;
         }
-      )
-    },
+    );
+  }
 
-    _getCheckerRequestObject() {
-      return {
-        "name" : this._name,
-        "description" : this._description || '',
-        "uuid" : this._uuid,
-        "repository": this._repos[0].name,
-        "url" : this._url,
-        "status": this._status,
-        "blocking": this._required ? ["STATE_NOT_PASSING"] : [],
-        "query": this._query
-      }
-    },
+  _getCheckerRequestObject() {
+    return {
+      name: this._name,
+      description: this._description || '',
+      uuid: this._uuid,
+      repository: this._repos[0].name,
+      url: this._url,
+      status: this._status,
+      blocking: this._required ? ['STATE_NOT_PASSING'] : [],
+      query: this._query,
+    };
+  }
 
-    handleCreateChecker() {
-      if (!this._validateRequest()) return;
-      // Currently after creating checker there is no reload happening (as
-      // this would result in the user exiting the screen).
-      this._createChecker(this._getCheckerRequestObject()).then(
+  handleCreateChecker() {
+    if (!this._validateRequest()) return;
+    // Currently after creating checker there is no reload happening (as
+    // this would result in the user exiting the screen).
+    this._createChecker(this._getCheckerRequestObject()).then(
         res => {
           if (res) this._cleanUp();
         },
         error => {
           this._errorMsg = error;
         }
-      )
-    },
+    );
+  }
 
-    _cleanUp() {
-      this._name = '';
-      this._scheme = '';
-      this._id = '';
-      this._uuid = '';
-      this._description = '';
-      this._repos = [];
+  _cleanUp() {
+    this._name = '';
+    this._scheme = '';
+    this._id = '';
+    this._uuid = '';
+    this._description = '';
+    this._repos = [];
+    this._repositorySelected = false;
+    this._errorMsg = '';
+    this._required = false;
+    this._query = '';
+    this._status = '';
+    this.dispatchEvent(new CustomEvent('cancel',
+        {
+          detail: {reload: true},
+          bubbles: true,
+          composed: true,
+        }
+    ));
+  }
+
+  _repoSuggestions(filter) {
+    const _makeSuggestion = repo => {
+      return {name: repo.name, value: repo};
+    };
+    return this.pluginRestApi.getRepos(filter, REPOS_PER_PAGE).then(
+        repos => repos.map(repo => _makeSuggestion(repo))
+    );
+  }
+
+  _handleRepositorySelected(e) {
+    this.push('_repos', e.detail.value);
+    this._repositorySelected = true;
+  }
+
+  _handleRequiredCheckBoxClicked() {
+    this._required = !this._required;
+  }
+
+  _handleOnRemove(e) {
+    const idx = this._repos.indexOf(e.detail.repo);
+    if (idx == -1) return;
+    this.splice('_repos', idx, 1);
+    if (this._repos.length == 0) {
       this._repositorySelected = false;
-      this._errorMsg = '';
-      this._required = false;
-      this._query = '';
-      this._status = '';
-      this.fire('cancel', {reload: true}, {bubbles: true});
-    },
+    }
+  }
+}
 
-    _repoSuggestions(filter) {
-      const _makeSuggestion = repo => {return {name: repo.name, value: repo}};
-      return this.pluginRestApi.getRepos(filter, REPOS_PER_PAGE).then(
-        repos => repos.map(repo =>  _makeSuggestion(repo))
-      )
-    },
-
-    _handleRepositorySelected(e) {
-      this.push('_repos', e.detail.value);
-      this._repositorySelected = true;
-    },
-
-    _handleRequiredCheckBoxClicked() {
-      this._required = !this._required;
-    },
-
-    _handleOnRemove(e) {
-      let idx = this._repos.indexOf(e.detail.repo);
-      if (idx == -1) return;
-      this.splice('_repos', idx, 1);
-      if (this._repos.length == 0) {
-        this._repositorySelected = false;
-      }
-    },
-
-  });
-})();
+customElements.define(GrCreateCheckersDialog.is, GrCreateCheckersDialog);
diff --git a/gr-checks/gr-create-checkers-dialog.html b/gr-checks/gr-create-checkers-dialog_html.js
similarity index 84%
rename from gr-checks/gr-create-checkers-dialog.html
rename to gr-checks/gr-create-checkers-dialog_html.js
index e9aad47..ac75927 100644
--- a/gr-checks/gr-create-checkers-dialog.html
+++ b/gr-checks/gr-create-checkers-dialog_html.js
@@ -1,6 +1,21 @@
-<link rel="import" href="gr-repo-chip.html">
-<dom-module id="gr-create-checkers-dialog">
-  <template>
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+export const htmlTemplate = Polymer.html`
     <style include="gr-form-styles">
       :host {
         display: inline-block;
@@ -28,6 +43,9 @@
       #checkerIdInput[disabled] {
         background-color: var(--table-subheader-background-color);
       }
+      .uuid {
+        overflow: scroll;
+      }
     </style>
 
     <div class="gr-form-styles">
@@ -116,7 +134,8 @@
         </section>
 
         <section>
-          <span class="title"> UUID {{_uuid}}</span>
+          <span class="title"> UUID </span>
+          <span class="title uuid"> {{_uuid}} </span>
         </section>
 
         <section>
@@ -152,6 +171,4 @@
       </div>
     </div>
     <gr-rest-api-interface id="restAPI"></gr-rest-api-interface>
-  </template>
-  <script src="gr-create-checkers-dialog.js"></script>
-</dom-module>
+`;
\ No newline at end of file
diff --git a/gr-checks/gr-repo-chip.html b/gr-checks/gr-repo-chip.html
deleted file mode 100644
index 5afd7f6..0000000
--- a/gr-checks/gr-repo-chip.html
+++ /dev/null
@@ -1,25 +0,0 @@
-<dom-module id="gr-repo-chip">
-  <template>
-    <style>
-      iron-icon {
-        height: 1.2rem;
-        width: 1.2rem;
-      }
-      :host {
-        display: inline-block;
-      }
-    </style>
-    <span> {{repo.name}} </span>
-    <gr-button
-      id="remove"
-      link
-      hidden$="[[!removable]]"
-      tabindex="-1"
-      aria-label="Remove"
-      class="remove"
-      on-click="_handleRemove">
-      <iron-icon icon="gr-icons:close"></iron-icon>
-    </gr-button>
-  </template>
-  <script src="gr-repo-chip.js"></script>
-</dom-module>
\ No newline at end of file
diff --git a/gr-checks/gr-repo-chip.js b/gr-checks/gr-repo-chip.js
index 0e1a0bd..2f20dfe 100644
--- a/gr-checks/gr-repo-chip.js
+++ b/gr-checks/gr-repo-chip.js
@@ -1,23 +1,81 @@
-(function() {
-  'use strict';
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/**
+ * autocomplete chip for getting repository suggestions
+ */
+class GrRepoChip extends Polymer.GestureEventListeners(
+    Polymer.LegacyElementMixin(
+        Polymer.Element)) {
+  /** @returns {string} name of the component */
+  static get is() { return 'gr-repo-chip'; }
+
+  /** @returns {?} template for this component */
+  static get template() {
+    return Polymer.html`
+    <style>
+      iron-icon {
+        height: 1.2rem;
+        width: 1.2rem;
+      }
+      :host {
+        display: inline-block;
+      }
+    </style>
+    <span> {{repo.name}} </span>
+    <gr-button
+      id="remove"
+      link
+      hidden$="[[!removable]]"
+      tabindex="-1"
+      aria-label="Remove"
+      class="remove"
+      on-click="_handleRemove">
+      <iron-icon icon="gr-icons:close"></iron-icon>
+    </gr-button>`;
+  }
 
   /**
-   * autocomplete chip for getting repository suggestions
+   * Defines properties of the component
+   *
+   * @returns {?}
    */
-  Polymer({
-    is: 'gr-repo-chip',
-    properties: {
+  static get properties() {
+    return {
       // repo type is ProjectInfo
       repo: Object,
       removable: {
         type: Boolean,
         value: true,
       },
-    },
-    _handleRemove(e) {
-      e.preventDefault();
-      this.fire('remove', {repo: this.repo});
-    },
-  })
+    };
+  }
 
-})();
\ No newline at end of file
+  /**
+   * @param {Event} e
+   */
+  _handleRemove(e) {
+    e.preventDefault();
+    this.dispatchEvent(new CustomEvent('remove',
+        {
+          detail: {repo: this.repo},
+          bubbles: true,
+          composed: true,
+        }));
+  }
+}
+
+customElements.define(GrRepoChip.is, GrRepoChip);
\ No newline at end of file
diff --git a/java/com/google/gerrit/plugins/checks/CheckJson.java b/java/com/google/gerrit/plugins/checks/CheckJson.java
index 535fbc4..b3225f1 100644
--- a/java/com/google/gerrit/plugins/checks/CheckJson.java
+++ b/java/com/google/gerrit/plugins/checks/CheckJson.java
@@ -16,7 +16,9 @@
 
 import com.google.common.collect.ImmutableSet;
 import com.google.common.flogger.FluentLogger;
+import com.google.gerrit.entities.Change;
 import com.google.gerrit.plugins.checks.api.CheckInfo;
+import com.google.gerrit.plugins.checks.api.CheckSubmitImpactInfo;
 import com.google.inject.Inject;
 import com.google.inject.Singleton;
 import com.google.inject.assistedinject.Assisted;
@@ -50,11 +52,13 @@
   }
 
   private final Checkers checkers;
+  private final Checks checks;
   private final ImmutableSet<ListChecksOption> options;
 
   @Inject
-  CheckJson(Checkers checkers, @Assisted Iterable<ListChecksOption> options) {
+  CheckJson(Checkers checkers, Checks checks, @Assisted Iterable<ListChecksOption> options) {
     this.checkers = checkers;
+    this.checks = checks;
     this.options = ImmutableSet.copyOf(options);
   }
 
@@ -75,12 +79,14 @@
     info.updated = check.updated();
 
     if (options.contains(ListChecksOption.CHECKER)) {
-      populateCheckerFields(check.key().checkerUuid(), info);
+      populateCheckerFields(check.key().checkerUuid(), info, check.key().patchSet().changeId());
     }
     return info;
   }
 
-  private void populateCheckerFields(CheckerUuid checkerUuid, CheckInfo info) throws IOException {
+  private void populateCheckerFields(CheckerUuid checkerUuid, CheckInfo info, Change.Id changeId)
+      throws IOException {
+
     try {
       checkers
           .getChecker(checkerUuid)
@@ -89,6 +95,9 @@
                 info.checkerName = checker.getName();
                 info.checkerStatus = checker.getStatus();
                 info.blocking = checker.getBlockingConditions();
+                info.submitImpact = new CheckSubmitImpactInfo();
+                info.submitImpact.required =
+                    checks.isRequiredForSubmit(checker, changeId) ? true : null;
                 info.checkerDescription = checker.getDescription().orElse(null);
               });
     } catch (ConfigInvalidException e) {
diff --git a/java/com/google/gerrit/plugins/checks/CheckerQuery.java b/java/com/google/gerrit/plugins/checks/CheckerQuery.java
index 332cf63..56f065d 100644
--- a/java/com/google/gerrit/plugins/checks/CheckerQuery.java
+++ b/java/com/google/gerrit/plugins/checks/CheckerQuery.java
@@ -44,7 +44,7 @@
 import com.google.gerrit.server.query.change.ChangeStatusPredicate;
 import com.google.gerrit.server.query.change.ProjectPredicate;
 import com.google.gerrit.server.update.RetryHelper;
-import com.google.gerrit.server.update.RetryHelper.ActionType;
+import com.google.gerrit.server.update.RetryableAction.ActionType;
 import com.google.inject.Inject;
 import com.google.inject.Provider;
 import java.util.ArrayList;
@@ -246,7 +246,7 @@
         predicateList.add(
             createQueryPredicate(checker.getUuid(), checker.getRepository(), checker.getQuery()));
       }
-      return executeIndexQueryWithRetry(qp -> {}, predicateList);
+      return executeIndexQueryWithRetry("queryMatchingChangesForCheckers", qp -> {}, predicateList);
     } catch (QueryParseException e) {
       throw new ConfigInvalidException(
           String.format(
@@ -269,7 +269,9 @@
       throws ConfigInvalidException, StorageException {
     try {
       return executeIndexQueryWithRetry(
-          queryProcessorSetup, createQueryPredicate(checkerUuid, repository, optionalQuery));
+          "queryMatchingChangesForChecker",
+          queryProcessorSetup,
+          createQueryPredicate(checkerUuid, repository, optionalQuery));
     } catch (QueryParseException e) {
       throw invalidQueryException(checkerUuid, optionalQuery, e);
     }
@@ -319,25 +321,32 @@
 
   // TODO(ekempin): Retrying the query should be done by ChangeQueryProcessor.
   private ImmutableList<ChangeData> executeIndexQueryWithRetry(
-      Consumer<ChangeQueryProcessor> queryProcessorSetup, Predicate<ChangeData> predicate)
+      String actionName,
+      Consumer<ChangeQueryProcessor> queryProcessorSetup,
+      Predicate<ChangeData> predicate)
       throws StorageException, QueryParseException {
-    return executeIndexQueryWithRetry(queryProcessorSetup, ImmutableList.of(predicate)).get(0);
+    return executeIndexQueryWithRetry(actionName, queryProcessorSetup, ImmutableList.of(predicate))
+        .get(0);
   }
 
   private ImmutableList<ImmutableList<ChangeData>> executeIndexQueryWithRetry(
-      Consumer<ChangeQueryProcessor> queryProcessorSetup, List<Predicate<ChangeData>> predicateList)
+      String actionName,
+      Consumer<ChangeQueryProcessor> queryProcessorSetup,
+      List<Predicate<ChangeData>> predicateList)
       throws StorageException, QueryParseException {
     try {
-      return retryHelper.execute(
-          ActionType.INDEX_QUERY,
-          () -> {
-            ChangeQueryProcessor qp = changeQueryProcessorProvider.get();
-            queryProcessorSetup.accept(qp);
-            return qp.query(predicateList).stream()
-                .map(predicate -> predicate.entities())
-                .collect(toImmutableList());
-          },
-          StorageException.class::isInstance);
+      return retryHelper
+          .action(
+              ActionType.INDEX_QUERY,
+              actionName,
+              () -> {
+                ChangeQueryProcessor qp = changeQueryProcessorProvider.get();
+                queryProcessorSetup.accept(qp);
+                return qp.query(predicateList).stream()
+                    .map(predicate -> predicate.entities())
+                    .collect(toImmutableList());
+              })
+          .call();
     } catch (Exception e) {
       Throwables.throwIfUnchecked(e);
       Throwables.throwIfInstanceOf(e, QueryParseException.class);
diff --git a/java/com/google/gerrit/plugins/checks/CheckerRef.java b/java/com/google/gerrit/plugins/checks/CheckerRef.java
index 2e7e263..6e2e246 100644
--- a/java/com/google/gerrit/plugins/checks/CheckerRef.java
+++ b/java/com/google/gerrit/plugins/checks/CheckerRef.java
@@ -24,7 +24,7 @@
   public static final String REFS_CHECKERS = "refs/checkers/";
 
   /** Ref that stores the repository to checkers map. */
-  public static final String REFS_META_CHECKERS = "refs/meta/checkers/";
+  public static final String REFS_META_CHECKERS = "refs/meta/checkers";
 
   /** Suffix for check refs. */
   public static final String CHECKS_SUFFIX = "/checks";
diff --git a/java/com/google/gerrit/plugins/checks/Checks.java b/java/com/google/gerrit/plugins/checks/Checks.java
index cf9d965..9ae249c 100644
--- a/java/com/google/gerrit/plugins/checks/Checks.java
+++ b/java/com/google/gerrit/plugins/checks/Checks.java
@@ -101,6 +101,15 @@
    */
   String getETag(Project.NameKey projectName, Change.Id changeId) throws IOException;
 
+  /**
+   * Returns whether the checker is required for submission for this change.
+   *
+   * @param checker The checker that is being checked whether it's required for submission.
+   * @param changeId The changeId of the change which submission requirement is in question.
+   * @return True if the checker is required for submit, false otherwise.
+   */
+  boolean isRequiredForSubmit(Checker checker, Change.Id changeId);
+
   @AutoValue
   abstract class GetCheckOptions {
     public static GetCheckOptions defaults() {
diff --git a/java/com/google/gerrit/plugins/checks/ChecksUpdate.java b/java/com/google/gerrit/plugins/checks/ChecksUpdate.java
index 63df867..6191cd2 100644
--- a/java/com/google/gerrit/plugins/checks/ChecksUpdate.java
+++ b/java/com/google/gerrit/plugins/checks/ChecksUpdate.java
@@ -17,12 +17,16 @@
 import com.google.common.collect.ImmutableMap;
 import com.google.common.flogger.FluentLogger;
 import com.google.gerrit.common.Nullable;
+import com.google.gerrit.entities.Change;
 import com.google.gerrit.entities.PatchSet;
+import com.google.gerrit.entities.Project;
 import com.google.gerrit.exceptions.DuplicateKeyException;
+import com.google.gerrit.extensions.api.changes.Changes;
 import com.google.gerrit.extensions.api.changes.NotifyHandling;
 import com.google.gerrit.extensions.api.changes.NotifyInfo;
 import com.google.gerrit.extensions.api.changes.RecipientType;
 import com.google.gerrit.extensions.restapi.BadRequestException;
+import com.google.gerrit.extensions.restapi.RestApiException;
 import com.google.gerrit.plugins.checks.Checks.GetCheckOptions;
 import com.google.gerrit.plugins.checks.api.CombinedCheckState;
 import com.google.gerrit.plugins.checks.email.CombinedCheckStateUpdatedSender;
@@ -64,6 +68,7 @@
   private final Checks checks;
   private final Checkers checkers;
   private final NotifyResolver notifyResolver;
+  private final Changes changes;
   private final Optional<IdentifiedUser> currentUser;
 
   @AssistedInject
@@ -76,6 +81,7 @@
       Checks checks,
       Checkers checkers,
       NotifyResolver notifyResolver,
+      Changes changes,
       @Assisted IdentifiedUser currentUser) {
     this.checksStorageUpdate = checksStorageUpdate;
     this.combinedCheckStateCache = combinedCheckStateCache;
@@ -85,6 +91,7 @@
     this.checks = checks;
     this.checkers = checkers;
     this.notifyResolver = notifyResolver;
+    this.changes = changes;
     this.currentUser = Optional.of(currentUser);
   }
 
@@ -97,7 +104,8 @@
       PatchSetUtil psUtil,
       Checks checks,
       Checkers checkers,
-      NotifyResolver notifyResolver) {
+      NotifyResolver notifyResolver,
+      Changes changes) {
     this.checksStorageUpdate = checksStorageUpdate;
     this.combinedCheckStateCache = combinedCheckStateCache;
     this.combinedCheckStateUpdatedSenderFactory = combinedCheckStateUpdatedSenderFactory;
@@ -106,6 +114,7 @@
     this.checks = checks;
     this.checkers = checkers;
     this.notifyResolver = notifyResolver;
+    this.changes = changes;
     this.currentUser = Optional.empty();
   }
 
@@ -122,6 +131,8 @@
 
     CombinedCheckState newCombinedCheckState =
         combinedCheckStateCache.get(key.repository(), key.patchSet());
+    maybeIndexChange(
+        oldCombinedCheckState, newCombinedCheckState, key.repository(), key.patchSet().changeId());
     maybeSendEmail(
         notifyHandling, notifyDetails, check, oldCombinedCheckState, newCombinedCheckState);
 
@@ -141,12 +152,28 @@
 
     CombinedCheckState newCombinedCheckState =
         combinedCheckStateCache.get(key.repository(), key.patchSet());
+    maybeIndexChange(
+        oldCombinedCheckState, newCombinedCheckState, key.repository(), key.patchSet().changeId());
     maybeSendEmail(
         notifyHandling, notifyDetails, check, oldCombinedCheckState, newCombinedCheckState);
 
     return check;
   }
 
+  private void maybeIndexChange(
+      CombinedCheckState oldState,
+      CombinedCheckState newState,
+      Project.NameKey project,
+      Change.Id changeId) {
+    if (oldState != newState) {
+      try {
+        changes.id(project.get(), changeId.get()).index();
+      } catch (RestApiException e) {
+        logger.atSevere().withCause(e).log("Cannot index change: %s after check update.", changeId);
+      }
+    }
+  }
+
   private void maybeSendEmail(
       @Nullable NotifyHandling notifyHandling,
       @Nullable Map<RecipientType, NotifyInfo> notifyDetails,
diff --git a/java/com/google/gerrit/plugins/checks/HttpModule.java b/java/com/google/gerrit/plugins/checks/HttpModule.java
index ca63ea3..752990b 100644
--- a/java/com/google/gerrit/plugins/checks/HttpModule.java
+++ b/java/com/google/gerrit/plugins/checks/HttpModule.java
@@ -28,6 +28,6 @@
     serveRegex("^/checkers/(.*)$").with(CheckersRestApiServlet.class);
     serveRegex("^/checks.pending/(.*)$").with(PendingChecksRestApiServlet.class);
 
-    DynamicSet.bind(binder(), WebUiPlugin.class).toInstance(new JavaScriptPlugin("checks.html"));
+    DynamicSet.bind(binder(), WebUiPlugin.class).toInstance(new JavaScriptPlugin("checks.js"));
   }
 }
diff --git a/java/com/google/gerrit/plugins/checks/Init.java b/java/com/google/gerrit/plugins/checks/Init.java
index 5e7407b..eddfad2 100644
--- a/java/com/google/gerrit/plugins/checks/Init.java
+++ b/java/com/google/gerrit/plugins/checks/Init.java
@@ -18,6 +18,7 @@
 import static com.google.gerrit.pgm.init.api.InitUtil.extract;
 
 import com.google.gerrit.pgm.init.api.InitStep;
+import com.google.gerrit.plugins.checks.db.CheckerRefMigration;
 import com.google.gerrit.plugins.checks.email.ChecksEmailModule;
 import com.google.gerrit.server.config.SitePaths;
 import com.google.inject.Inject;
@@ -25,16 +26,19 @@
 
 public class Init implements InitStep {
   private final SitePaths site;
+  private final CheckerRefMigration checkerRefMigration;
 
   @Inject
-  Init(SitePaths site) {
+  Init(SitePaths site, CheckerRefMigration checkerRefMigration) {
     this.site = site;
+    this.checkerRefMigration = checkerRefMigration;
   }
 
   @Override
   public void run() throws Exception {
     extractMailExample("CombinedCheckStateUpdated.soy");
     extractMailExample("CombinedCheckStateUpdatedHtml.soy");
+    checkerRefMigration.migrate();
   }
 
   private void extractMailExample(String orig) throws Exception {
diff --git a/java/com/google/gerrit/plugins/checks/api/CheckInfo.java b/java/com/google/gerrit/plugins/checks/api/CheckInfo.java
index d0d5c38..4766990 100644
--- a/java/com/google/gerrit/plugins/checks/api/CheckInfo.java
+++ b/java/com/google/gerrit/plugins/checks/api/CheckInfo.java
@@ -56,6 +56,9 @@
   /** Blocking conditions that apply to this check. */
   public Set<BlockingCondition> blocking;
 
+  /** Submit impact of this check. */
+  public CheckSubmitImpactInfo submitImpact;
+
   /** Description of the checker that produced this check */
   public String checkerDescription;
 
@@ -79,6 +82,7 @@
         && Objects.equals(other.checkerName, checkerName)
         && Objects.equals(other.checkerStatus, checkerStatus)
         && Objects.equals(other.blocking, blocking)
+        && Objects.equals(other.submitImpact, submitImpact)
         && Objects.equals(other.checkerDescription, checkerDescription);
   }
 
@@ -99,6 +103,7 @@
         checkerName,
         checkerStatus,
         blocking,
+        submitImpact,
         checkerDescription);
   }
 
@@ -119,6 +124,7 @@
         .add("checkerName", checkerName)
         .add("checkerStatus", checkerStatus)
         .add("blocking", blocking)
+        .add("submitImpact", submitImpact)
         .add("checkerDescription", checkerDescription)
         .toString();
   }
diff --git a/java/com/google/gerrit/plugins/checks/api/CheckSubmitImpactInfo.java b/java/com/google/gerrit/plugins/checks/api/CheckSubmitImpactInfo.java
new file mode 100644
index 0000000..6c99574
--- /dev/null
+++ b/java/com/google/gerrit/plugins/checks/api/CheckSubmitImpactInfo.java
@@ -0,0 +1,51 @@
+// Copyright (C) 2020 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.plugins.checks.api;
+
+import com.google.common.base.MoreObjects;
+import java.util.Objects;
+
+/**
+ * Summary of the impact the check has on the submission of the change. Besides a general
+ * indication, this may also include related details which help users to better understand that
+ * impact.
+ */
+public class CheckSubmitImpactInfo {
+
+  /**
+   * Indicates whether this check is included in submit considerations of the change. This depends
+   * on various factors and can change over the lifetime of a check.
+   */
+  public Boolean required;
+
+  @Override
+  public boolean equals(Object o) {
+    if (!(o instanceof CheckSubmitImpactInfo)) {
+      return false;
+    }
+    CheckSubmitImpactInfo other = (CheckSubmitImpactInfo) o;
+    return Objects.equals(other.required, required);
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(required);
+  }
+
+  @Override
+  public String toString() {
+    return MoreObjects.toStringHelper(this).add("required", required).toString();
+  }
+}
diff --git a/java/com/google/gerrit/plugins/checks/api/CreateChecker.java b/java/com/google/gerrit/plugins/checks/api/CreateChecker.java
index 86765b9..fdaaed1 100644
--- a/java/com/google/gerrit/plugins/checks/api/CreateChecker.java
+++ b/java/com/google/gerrit/plugins/checks/api/CreateChecker.java
@@ -140,16 +140,18 @@
   }
 
   private Project.NameKey resolveRepository(String repository)
-      throws BadRequestException, UnprocessableEntityException, IOException {
+      throws BadRequestException, UnprocessableEntityException {
     if (repository == null || repository.trim().isEmpty()) {
       throw new BadRequestException("repository is required");
     }
 
-    ProjectState projectState = projectCache.checkedGet(Project.nameKey(repository.trim()));
-    if (projectState == null) {
-      throw new UnprocessableEntityException(String.format("repository %s not found", repository));
-    }
-
+    ProjectState projectState =
+        projectCache
+            .get(Project.nameKey(repository.trim()))
+            .orElseThrow(
+                () ->
+                    new UnprocessableEntityException(
+                        String.format("repository %s not found", repository)));
     return projectState.getNameKey();
   }
 
diff --git a/java/com/google/gerrit/plugins/checks/api/PostCheck.java b/java/com/google/gerrit/plugins/checks/api/PostCheck.java
index aaad490..cf7cbd3 100644
--- a/java/com/google/gerrit/plugins/checks/api/PostCheck.java
+++ b/java/com/google/gerrit/plugins/checks/api/PostCheck.java
@@ -36,6 +36,7 @@
 import com.google.gerrit.server.CurrentUser;
 import com.google.gerrit.server.UserInitiated;
 import com.google.gerrit.server.change.RevisionResource;
+import com.google.gerrit.server.config.PluginConfigFactory;
 import com.google.gerrit.server.permissions.PermissionBackend;
 import com.google.gerrit.server.permissions.PermissionBackendException;
 import java.io.IOException;
@@ -55,6 +56,7 @@
   private final Checks checks;
   private final Provider<ChecksUpdate> checksUpdate;
   private final CheckJson.Factory checkJsonFactory;
+  private final PluginConfigFactory pluginConfigFactory;
 
   @Inject
   PostCheck(
@@ -64,7 +66,8 @@
       Checkers checkers,
       Checks checks,
       @UserInitiated Provider<ChecksUpdate> checksUpdate,
-      CheckJson.Factory checkJsonFactory) {
+      CheckJson.Factory checkJsonFactory,
+      PluginConfigFactory pluginConfigFactory) {
     this.self = self;
     this.permissionBackend = permissionBackend;
     this.permission = permission;
@@ -72,6 +75,7 @@
     this.checks = checks;
     this.checksUpdate = checksUpdate;
     this.checkJsonFactory = checkJsonFactory;
+    this.pluginConfigFactory = pluginConfigFactory;
   }
 
   @Override
@@ -102,6 +106,7 @@
     CheckKey key = CheckKey.create(rsrc.getProject(), rsrc.getPatchSet().id(), checkerUuid);
     Optional<Check> check = checks.getCheck(key, GetCheckOptions.defaults());
     Check updatedCheck;
+    CheckUpdate checkUpdate = toCheckUpdate(input);
     if (!check.isPresent()) {
       checkers
           .getChecker(checkerUuid)
@@ -110,19 +115,15 @@
                   new UnprocessableEntityException(
                       String.format("checker %s not found", checkerUuid)));
       updatedCheck =
-          checksUpdate
-              .get()
-              .createCheck(key, toCheckUpdate(input), input.notify, input.notifyDetails);
+          checksUpdate.get().createCheck(key, checkUpdate, input.notify, input.notifyDetails);
     } else {
       updatedCheck =
-          checksUpdate
-              .get()
-              .updateCheck(key, toCheckUpdate(input), input.notify, input.notifyDetails);
+          checksUpdate.get().updateCheck(key, checkUpdate, input.notify, input.notifyDetails);
     }
     return Response.ok(checkJsonFactory.noOptions().format(updatedCheck));
   }
 
-  private static CheckUpdate toCheckUpdate(CheckInput input) throws BadRequestException {
+  private CheckUpdate toCheckUpdate(CheckInput input) throws BadRequestException {
     CheckUpdate.Builder checkUpdateBuilder = CheckUpdate.builder();
 
     if (input.state != null) {
@@ -130,7 +131,9 @@
     }
 
     if (input.message != null) {
-      checkUpdateBuilder.setMessage(input.message.trim());
+      String message = input.message.trim();
+      checkMessageSizeLimit(message.length());
+      checkUpdateBuilder.setMessage(message);
     }
 
     if (input.url != null) {
@@ -147,4 +150,14 @@
 
     return checkUpdateBuilder.build();
   }
+
+  private void checkMessageSizeLimit(int messageSize) throws BadRequestException {
+    int messageSizeLimit =
+        pluginConfigFactory.getFromGerritConfig("checks").getInt("messageSizeLimit", 10_000);
+    if (messageSize > messageSizeLimit) {
+      throw new BadRequestException(
+          String.format(
+              "Field \"message\" exceeds size limit (%d > %d)", messageSize, messageSizeLimit));
+    }
+  }
 }
diff --git a/java/com/google/gerrit/plugins/checks/api/UpdateChecker.java b/java/com/google/gerrit/plugins/checks/api/UpdateChecker.java
index 93f5b09..2841349 100644
--- a/java/com/google/gerrit/plugins/checks/api/UpdateChecker.java
+++ b/java/com/google/gerrit/plugins/checks/api/UpdateChecker.java
@@ -125,16 +125,18 @@
   }
 
   private Project.NameKey resolveRepository(String repository)
-      throws BadRequestException, UnprocessableEntityException, IOException {
+      throws BadRequestException, UnprocessableEntityException {
     if (repository == null || repository.trim().isEmpty()) {
       throw new BadRequestException("repository cannot be unset");
     }
 
-    ProjectState projectState = projectCache.checkedGet(Project.nameKey(repository.trim()));
-    if (projectState == null) {
-      throw new UnprocessableEntityException(String.format("repository %s not found", repository));
-    }
-
+    ProjectState projectState =
+        projectCache
+            .get(Project.nameKey(repository.trim()))
+            .orElseThrow(
+                () ->
+                    new UnprocessableEntityException(
+                        String.format("repository %s not found", repository)));
     return projectState.getNameKey();
   }
 
diff --git a/java/com/google/gerrit/plugins/checks/db/CheckerRefMigration.java b/java/com/google/gerrit/plugins/checks/db/CheckerRefMigration.java
new file mode 100644
index 0000000..40eb858
--- /dev/null
+++ b/java/com/google/gerrit/plugins/checks/db/CheckerRefMigration.java
@@ -0,0 +1,94 @@
+// Copyright (C) 2020 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+package com.google.gerrit.plugins.checks.db;
+
+import com.google.common.annotations.VisibleForTesting;
+import com.google.gerrit.entities.Project;
+import com.google.gerrit.pgm.init.api.AllProjectsNameOnInitProvider;
+import com.google.gerrit.plugins.checks.CheckerRef;
+import com.google.gerrit.server.git.GitRepositoryManager;
+import com.google.inject.Inject;
+import com.google.inject.Singleton;
+import java.io.IOException;
+import org.eclipse.jgit.lib.ObjectId;
+import org.eclipse.jgit.lib.Ref;
+import org.eclipse.jgit.lib.RefRename;
+import org.eclipse.jgit.lib.RefUpdate;
+import org.eclipse.jgit.lib.RefUpdate.Result;
+import org.eclipse.jgit.lib.Repository;
+
+@Singleton
+public class CheckerRefMigration {
+  private static final String TMP_REF = "refs/tmp/checker-migration";
+  private static final String LEGACY_REFS_META_CHECKERS = "refs/meta/checkers/";
+
+  private final GitRepositoryManager repoManager;
+  private final Project.NameKey allProjectsName;
+
+  @Inject
+  CheckerRefMigration(
+      GitRepositoryManager repoManager, AllProjectsNameOnInitProvider allProjectsNameProvider) {
+    this(repoManager, Project.nameKey(allProjectsNameProvider.get()));
+  }
+
+  @VisibleForTesting
+  CheckerRefMigration(GitRepositoryManager repoManager, Project.NameKey allProjectsName) {
+    this.repoManager = repoManager;
+    this.allProjectsName = allProjectsName;
+  }
+
+  public void migrate() throws Exception {
+    try (Repository repo = repoManager.openRepository(allProjectsName)) {
+
+      // This part is specifically for cases where the rename failed half-way last time.
+      Ref ref = repo.exactRef(TMP_REF);
+      if (ref != null) {
+        renameRef(TMP_REF, CheckerRef.REFS_META_CHECKERS, repo);
+      }
+
+      ref = repo.exactRef(LEGACY_REFS_META_CHECKERS);
+      if (ref == null) {
+        return;
+      }
+      renameRef(LEGACY_REFS_META_CHECKERS, TMP_REF, repo);
+      renameRef(TMP_REF, CheckerRef.REFS_META_CHECKERS, repo);
+    } catch (Exception ex) {
+      throw new IllegalStateException(
+          ex.getMessage()
+              + " Ensure that refs/tmp/checker-migration doesn't exist. Also,"
+              + "ensure that refs/meta/checkers/ (with trailing '/') has been migrated to refs/meta/checkers (without "
+              + "trailing '/'). Consider documentation for updating refs manually: https://git-scm.com/docs/git-update-ref");
+    }
+  }
+
+  private void renameRef(String currentName, String targetName, Repository repo)
+      throws IOException {
+    RefRename refRename = repo.renameRef(currentName, targetName);
+    Result result = refRename.rename();
+    if (result != Result.RENAMED) {
+      throw new IllegalStateException(
+          String.format(
+              "Rename of %s to %s failed with the failure: %s.",
+              currentName, targetName, result.name()));
+    }
+    // After the rename, we need to delete. For same reason, due to a bug in JGit, the rename
+    // doesn't delete the previous
+    // name.
+    RefUpdate update = repo.updateRef(currentName);
+    update.setExpectedOldObjectId(repo.exactRef(currentName).getObjectId());
+    update.setNewObjectId(ObjectId.zeroId());
+    update.setForceUpdate(true);
+    update.delete();
+  }
+}
diff --git a/java/com/google/gerrit/plugins/checks/db/CheckersByRepositoryNotes.java b/java/com/google/gerrit/plugins/checks/db/CheckersByRepositoryNotes.java
index 3d99cbb..5019e9e 100644
--- a/java/com/google/gerrit/plugins/checks/db/CheckersByRepositoryNotes.java
+++ b/java/com/google/gerrit/plugins/checks/db/CheckersByRepositoryNotes.java
@@ -31,6 +31,7 @@
 import com.google.common.hash.Hashing;
 import com.google.gerrit.common.Nullable;
 import com.google.gerrit.entities.Project;
+import com.google.gerrit.exceptions.StorageException;
 import com.google.gerrit.plugins.checks.CheckerRef;
 import com.google.gerrit.plugins.checks.CheckerUuid;
 import com.google.gerrit.server.config.AllProjectsName;
@@ -111,7 +112,18 @@
 
   @Override
   protected String getRefName() {
-    return CheckerRef.REFS_META_CHECKERS;
+    // To allow for an online migration of the old checker ref (refs/meta/checkers/) to the new ref
+    // (refs/meta/checkers) we need to check which state we are in here. If we omit the legacy ref
+    // exists, we operate on that instead. The migration will move to the new ref eventually and
+    // delete the old ref. At that point, we'll start using the new ref here.
+    // TODO(paiking): Remove when migration on googlesource.com is done.
+    try {
+      return repo.exactRef("refs/meta/checkers/") != null
+          ? "refs/meta/checkers/"
+          : CheckerRef.REFS_META_CHECKERS;
+    } catch (IOException e) {
+      throw new StorageException(e);
+    }
   }
 
   /**
diff --git a/java/com/google/gerrit/plugins/checks/db/NoteDbCheckersUpdate.java b/java/com/google/gerrit/plugins/checks/db/NoteDbCheckersUpdate.java
index 0e1d875..72b01c2 100644
--- a/java/com/google/gerrit/plugins/checks/db/NoteDbCheckersUpdate.java
+++ b/java/com/google/gerrit/plugins/checks/db/NoteDbCheckersUpdate.java
@@ -17,7 +17,6 @@
 import com.google.common.base.Throwables;
 import com.google.gerrit.entities.Project;
 import com.google.gerrit.exceptions.DuplicateKeyException;
-import com.google.gerrit.git.LockFailureException;
 import com.google.gerrit.git.RefUpdateUtil;
 import com.google.gerrit.plugins.checks.Checker;
 import com.google.gerrit.plugins.checks.CheckerCreation;
@@ -33,7 +32,6 @@
 import com.google.gerrit.server.git.GitRepositoryManager;
 import com.google.gerrit.server.git.meta.MetaDataUpdate;
 import com.google.gerrit.server.update.RetryHelper;
-import com.google.gerrit.server.update.RetryHelper.ActionType;
 import com.google.inject.assistedinject.Assisted;
 import com.google.inject.assistedinject.AssistedInject;
 import java.io.IOException;
@@ -137,10 +135,10 @@
   public Checker createChecker(CheckerCreation checkerCreation, CheckerUpdate checkerUpdate)
       throws DuplicateKeyException, IOException, ConfigInvalidException {
     try {
-      return retryHelper.execute(
-          RetryHelper.ActionType.PLUGIN_UPDATE,
-          () -> createCheckerInNoteDb(checkerCreation, checkerUpdate),
-          LockFailureException.class::isInstance);
+      return retryHelper
+          .pluginUpdate(
+              "createChecker", () -> createCheckerInNoteDb(checkerCreation, checkerUpdate))
+          .call();
     } catch (Exception e) {
       Throwables.throwIfUnchecked(e);
       Throwables.throwIfInstanceOf(e, DuplicateKeyException.class);
@@ -231,10 +229,9 @@
   private Checker updateCheckerWithRetry(CheckerUuid checkerUuid, CheckerUpdate checkerUpdate)
       throws NoSuchCheckerException, IOException, ConfigInvalidException {
     try {
-      return retryHelper.execute(
-          ActionType.PLUGIN_UPDATE,
-          () -> updateCheckerInNoteDb(checkerUuid, checkerUpdate),
-          LockFailureException.class::isInstance);
+      return retryHelper
+          .pluginUpdate("updateChecker", () -> updateCheckerInNoteDb(checkerUuid, checkerUpdate))
+          .call();
     } catch (Exception e) {
       Throwables.throwIfUnchecked(e);
       Throwables.throwIfInstanceOf(e, IOException.class);
diff --git a/java/com/google/gerrit/plugins/checks/db/NoteDbChecks.java b/java/com/google/gerrit/plugins/checks/db/NoteDbChecks.java
index af8cabc..44f3d70 100644
--- a/java/com/google/gerrit/plugins/checks/db/NoteDbChecks.java
+++ b/java/com/google/gerrit/plugins/checks/db/NoteDbChecks.java
@@ -167,7 +167,6 @@
 
   private ImmutableListMultimap<CheckState, Boolean> getStatesAndRequiredMap(
       Project.NameKey projectName, PatchSet.Id patchSetId) throws IOException, StorageException {
-    ChangeData changeData = changeDataFactory.create(projectName, patchSetId.changeId());
     ImmutableMap<String, Checker> allCheckersOfProject =
         checkers.checkersOf(projectName).stream()
             .collect(ImmutableMap.toImmutableMap(c -> c.getUuid().get(), c -> c));
@@ -192,16 +191,22 @@
         continue;
       }
 
-      boolean isRequired =
-          checker.getStatus() == CheckerStatus.ENABLED
-              && checker.isRequired()
-              && checkerQueryProvider.get().isCheckerRelevant(checker, changeData);
+      boolean isRequired = isRequiredForSubmit(checker, patchSetId.changeId());
       statesAndRequired.put(check.state(), isRequired);
     }
 
     return statesAndRequired.build();
   }
 
+  @Override
+  public boolean isRequiredForSubmit(Checker checker, Change.Id changeId) {
+    ChangeData changeData = changeDataFactory.create(checker.getRepository(), changeId);
+
+    return checker.getStatus() == CheckerStatus.ENABLED
+        && checker.isRequired()
+        && checkerQueryProvider.get().isCheckerRelevant(checker, changeData);
+  }
+
   private ImmutableList<Checker> getCheckersForBackfiller(
       Project.NameKey projectName, List<Check> existingChecks) throws IOException {
     ImmutableSet<CheckerUuid> checkersWithExistingChecks =
diff --git a/java/com/google/gerrit/plugins/checks/db/NoteDbChecksUpdate.java b/java/com/google/gerrit/plugins/checks/db/NoteDbChecksUpdate.java
index 467a7bd..e9cb9bb 100644
--- a/java/com/google/gerrit/plugins/checks/db/NoteDbChecksUpdate.java
+++ b/java/com/google/gerrit/plugins/checks/db/NoteDbChecksUpdate.java
@@ -21,7 +21,6 @@
 import com.google.common.base.Throwables;
 import com.google.common.collect.Maps;
 import com.google.gerrit.exceptions.DuplicateKeyException;
-import com.google.gerrit.git.LockFailureException;
 import com.google.gerrit.git.RefUpdateUtil;
 import com.google.gerrit.plugins.checks.Check;
 import com.google.gerrit.plugins.checks.CheckKey;
@@ -141,10 +140,10 @@
   public Check createCheck(CheckKey checkKey, CheckUpdate checkUpdate)
       throws DuplicateKeyException, IOException {
     try {
-      return retryHelper.execute(
-          RetryHelper.ActionType.PLUGIN_UPDATE,
-          () -> upsertCheckInNoteDb(checkKey, checkUpdate, Operation.CREATE),
-          LockFailureException.class::isInstance);
+      return retryHelper
+          .pluginUpdate(
+              "createCheck", () -> upsertCheckInNoteDb(checkKey, checkUpdate, Operation.CREATE))
+          .call();
     } catch (Exception e) {
       Throwables.throwIfUnchecked(e);
       Throwables.throwIfInstanceOf(e, DuplicateKeyException.class);
@@ -156,10 +155,10 @@
   @Override
   public Check updateCheck(CheckKey checkKey, CheckUpdate checkUpdate) throws IOException {
     try {
-      return retryHelper.execute(
-          RetryHelper.ActionType.PLUGIN_UPDATE,
-          () -> upsertCheckInNoteDb(checkKey, checkUpdate, Operation.UPDATE),
-          LockFailureException.class::isInstance);
+      return retryHelper
+          .pluginUpdate(
+              "updateCheck", () -> upsertCheckInNoteDb(checkKey, checkUpdate, Operation.UPDATE))
+          .call();
     } catch (Exception e) {
       Throwables.throwIfUnchecked(e);
       Throwables.throwIfInstanceOf(e, IOException.class);
diff --git a/javatests/com/google/gerrit/plugins/checks/acceptance/api/ChecksEmailIT.java b/javatests/com/google/gerrit/plugins/checks/acceptance/api/ChecksEmailIT.java
index 2edc6a6..d4fe337 100644
--- a/javatests/com/google/gerrit/plugins/checks/acceptance/api/ChecksEmailIT.java
+++ b/javatests/com/google/gerrit/plugins/checks/acceptance/api/ChecksEmailIT.java
@@ -77,7 +77,7 @@
   public void setup() throws Exception {
     // Create a bot account, create a bots group and add the bot as member and allow the bots group
     // to post checks.
-    bot = accountCreator.create("bot", "bot@test.com", "Bot");
+    bot = accountCreator.create("bot", "bot@test.com", "Bot", null);
     AccountGroup.UUID botsAccountGroupUuid =
         groupOperations.newGroup().name("bots").addMember(bot.id()).create();
     projectOperations
@@ -93,16 +93,16 @@
     patchSetId = result.getPatchSetId();
 
     // Add a reviewer.
-    reviewer = accountCreator.create("reviewer", "reviewer@test.com", "Reviewer");
+    reviewer = accountCreator.create("reviewer", "reviewer@test.com", "Reviewer", null);
     gApi.changes().id(patchSetId.changeId().get()).addReviewer(reviewer.username());
 
     // Star the change from some user.
-    starrer = accountCreator.create("starred", "starrer@test.com", "Starrer");
+    starrer = accountCreator.create("starred", "starrer@test.com", "Starrer", null);
     requestScopeOperations.setApiUser(starrer.id());
     gApi.accounts().self().starChange(patchSetId.changeId().toString());
 
     // Watch all comments of change from some user.
-    watcher = accountCreator.create("watcher", "watcher@test.com", "Watcher");
+    watcher = accountCreator.create("watcher", "watcher@test.com", "Watcher", null);
     requestScopeOperations.setApiUser(watcher.id());
     ProjectWatchInfo projectWatchInfo = new ProjectWatchInfo();
     projectWatchInfo.project = project.get();
@@ -113,7 +113,10 @@
     // Watch only change creations from some user --> user doesn't get notified by checks plugin.
     TestAccount changeCreationWatcher =
         accountCreator.create(
-            "changeCreationWatcher", "changeCreationWatcher@test.com", "Change Creation Watcher");
+            "changeCreationWatcher",
+            "changeCreationWatcher@test.com",
+            "Change Creation Watcher",
+            null);
     requestScopeOperations.setApiUser(changeCreationWatcher.id());
     projectWatchInfo = new ProjectWatchInfo();
     projectWatchInfo.project = project.get();
@@ -122,7 +125,7 @@
     gApi.accounts().self().setWatchedProjects(ImmutableList.of(projectWatchInfo));
 
     // Add a reviewer that ignores the change --> user doesn't get notified by checks plugin.
-    ignoringReviewer = accountCreator.create("ignorer", "ignorer@test.com", "Ignorer");
+    ignoringReviewer = accountCreator.create("ignorer", "ignorer@test.com", "Ignorer", null);
     requestScopeOperations.setApiUser(admin.id());
     gApi.changes().id(patchSetId.changeId().get()).addReviewer(ignoringReviewer.username());
     requestScopeOperations.setApiUser(ignoringReviewer.id());
@@ -157,10 +160,10 @@
     assertThat(messages).hasSize(1);
 
     Message message = messages.get(0);
-    assertThat(message.from().getName()).isEqualTo(bot.fullName() + " (Code Review)");
+    assertThat(message.from().name()).isEqualTo(bot.fullName() + " (Code Review)");
     assertThat(message.body())
         .contains("The combined check state has been updated to " + CombinedCheckState.FAILED);
-    assertThat(message.rcpt()).containsExactly(owner.getEmailAddress());
+    assertThat(message.rcpt()).containsExactly(owner.getNameEmail());
   }
 
   @Test
@@ -188,15 +191,15 @@
     assertThat(messages).hasSize(1);
 
     Message message = messages.get(0);
-    assertThat(message.from().getName()).isEqualTo(bot.fullName() + " (Code Review)");
+    assertThat(message.from().name()).isEqualTo(bot.fullName() + " (Code Review)");
     assertThat(message.body())
         .contains("The combined check state has been updated to " + CombinedCheckState.SUCCESSFUL);
     assertThat(message.rcpt())
         .containsExactly(
-            owner.getEmailAddress(),
-            reviewer.getEmailAddress(),
-            starrer.getEmailAddress(),
-            watcher.getEmailAddress());
+            owner.getNameEmail(),
+            reviewer.getNameEmail(),
+            starrer.getNameEmail(),
+            watcher.getNameEmail());
   }
 
   @Test
@@ -255,10 +258,10 @@
     assertThat(messages).hasSize(1);
 
     Message message = messages.get(0);
-    assertThat(message.from().getName()).isEqualTo(bot.fullName() + " (Code Review)");
+    assertThat(message.from().name()).isEqualTo(bot.fullName() + " (Code Review)");
     assertThat(message.body())
         .contains("The combined check state has been updated to " + CombinedCheckState.IN_PROGRESS);
-    assertThat(message.rcpt()).containsExactly(owner.getEmailAddress());
+    assertThat(message.rcpt()).containsExactly(owner.getNameEmail());
   }
 
   @Test
@@ -289,15 +292,15 @@
     assertThat(messages).hasSize(1);
 
     Message message = messages.get(0);
-    assertThat(message.from().getName()).isEqualTo(bot.fullName() + " (Code Review)");
+    assertThat(message.from().name()).isEqualTo(bot.fullName() + " (Code Review)");
     assertThat(message.body())
         .contains("The combined check state has been updated to " + CombinedCheckState.SUCCESSFUL);
     assertThat(message.rcpt())
         .containsExactly(
-            owner.getEmailAddress(),
-            reviewer.getEmailAddress(),
-            starrer.getEmailAddress(),
-            watcher.getEmailAddress());
+            owner.getNameEmail(),
+            reviewer.getNameEmail(),
+            starrer.getNameEmail(),
+            watcher.getNameEmail());
   }
 
   @Test
@@ -355,10 +358,10 @@
     assertThat(messages).hasSize(1);
 
     Message message = messages.get(0);
-    assertThat(message.from().getName()).isEqualTo(bot.fullName() + " (Code Review)");
+    assertThat(message.from().name()).isEqualTo(bot.fullName() + " (Code Review)");
     assertThat(message.body())
         .contains("The combined check state has been updated to " + CombinedCheckState.IN_PROGRESS);
-    assertThat(message.rcpt()).containsExactly(owner.getEmailAddress());
+    assertThat(message.rcpt()).containsExactly(owner.getNameEmail());
   }
 
   @Test
@@ -455,13 +458,13 @@
       assertThat(messages).hasSize(1);
 
       Message message = messages.get(0);
-      assertThat(message.from().getName()).isEqualTo(bot.fullName() + " (Code Review)");
+      assertThat(message.from().name()).isEqualTo(bot.fullName() + " (Code Review)");
       assertThat(message.body())
           .contains("The combined check state has been updated to " + CombinedCheckState.FAILED);
       assertThat(message.rcpt())
           .containsExactlyElementsIn(
               Arrays.stream(expectedRecipients)
-                  .map(TestAccount::getEmailAddress)
+                  .map(TestAccount::getNameEmail)
                   .collect(toImmutableList()));
     }
 
@@ -539,14 +542,14 @@
       assertThat(messages).hasSize(1);
 
       Message message = messages.get(0);
-      assertThat(message.from().getName()).isEqualTo(bot.fullName() + " (Code Review)");
+      assertThat(message.from().name()).isEqualTo(bot.fullName() + " (Code Review)");
       assertThat(message.body())
           .contains(
               "The combined check state has been updated to " + CombinedCheckState.IN_PROGRESS);
       assertThat(message.rcpt())
           .containsExactlyElementsIn(
               Arrays.stream(expectedRecipients)
-                  .map(TestAccount::getEmailAddress)
+                  .map(TestAccount::getNameEmail)
                   .collect(toImmutableList()));
     }
   }
diff --git a/javatests/com/google/gerrit/plugins/checks/acceptance/api/GetCheckIT.java b/javatests/com/google/gerrit/plugins/checks/acceptance/api/GetCheckIT.java
index b494146..ee3c261 100644
--- a/javatests/com/google/gerrit/plugins/checks/acceptance/api/GetCheckIT.java
+++ b/javatests/com/google/gerrit/plugins/checks/acceptance/api/GetCheckIT.java
@@ -43,6 +43,7 @@
 import com.google.gerrit.plugins.checks.acceptance.testsuite.CheckerTestData;
 import com.google.gerrit.plugins.checks.api.CheckInfo;
 import com.google.gerrit.plugins.checks.api.CheckState;
+import com.google.gerrit.plugins.checks.api.CheckSubmitImpactInfo;
 import com.google.gerrit.plugins.checks.api.CheckerStatus;
 import com.google.gerrit.testing.TestTimeUtil;
 import com.google.gson.reflect.TypeToken;
@@ -95,6 +96,8 @@
     expectedCheckInfo.checkerName = "My Checker";
     expectedCheckInfo.checkerStatus = CheckerStatus.ENABLED;
     expectedCheckInfo.blocking = ImmutableSortedSet.of();
+    expectedCheckInfo.submitImpact = new CheckSubmitImpactInfo();
+    expectedCheckInfo.submitImpact.required = null;
     expectedCheckInfo.checkerDescription = "Description";
     assertThat(getCheckInfo(patchSetId, checkerUuid, ListChecksOption.CHECKER))
         .isEqualTo(expectedCheckInfo);
@@ -113,6 +116,8 @@
     expectedCheckInfo.checkerName = "My Checker";
     expectedCheckInfo.checkerStatus = CheckerStatus.ENABLED;
     expectedCheckInfo.blocking = ImmutableSortedSet.of();
+    expectedCheckInfo.submitImpact = new CheckSubmitImpactInfo();
+    expectedCheckInfo.submitImpact.required = null;
 
     RestResponse r =
         adminRestSession.get(
@@ -261,7 +266,7 @@
   }
 
   @Test
-  public void getCheckReturnsBlockingConditionsOnlyForCheckerOption() throws Exception {
+  public void getCheckReturnsSubmitImpactOnlyForCheckerOption() throws Exception {
     CheckerUuid checkerUuid =
         checkerOperations.newChecker().repository(project).required().create();
 
@@ -271,6 +276,36 @@
     assertThat(getCheckInfo(patchSetId, checkerUuid).blocking).isNull();
     assertThat(getCheckInfo(patchSetId, checkerUuid, ListChecksOption.CHECKER).blocking)
         .isNotEmpty();
+    assertThat(getCheckInfo(patchSetId, checkerUuid).submitImpact).isNull();
+    assertThat(getCheckInfo(patchSetId, checkerUuid, ListChecksOption.CHECKER).submitImpact)
+        .isNotNull();
+  }
+
+  @Test
+  public void notApplyingButRequiredCheckerIsNotRequiredForSubmission() throws Exception {
+    CheckerUuid checkerUuid =
+        checkerOperations
+            .newChecker()
+            .repository(project)
+            .query("status:merged")
+            .required()
+            .create();
+    CheckKey checkKey = CheckKey.create(project, patchSetId, checkerUuid);
+    checkOperations.newCheck(checkKey).upsert();
+    assertThat(
+            getCheckInfo(patchSetId, checkerUuid, ListChecksOption.CHECKER).submitImpact.required)
+        .isNull();
+  }
+
+  @Test
+  public void disabledButRequiredCheckerIsNotRequiredForSubmission() throws Exception {
+    CheckerUuid checkerUuid =
+        checkerOperations.newChecker().repository(project).disable().required().create();
+    CheckKey checkKey = CheckKey.create(project, patchSetId, checkerUuid);
+    checkOperations.newCheck(checkKey).upsert();
+    assertThat(
+            getCheckInfo(patchSetId, checkerUuid, ListChecksOption.CHECKER).submitImpact.required)
+        .isNull();
   }
 
   @Test
@@ -289,6 +324,7 @@
     // Checker fields are not set.
     assertThat(check.checkerName).isNull();
     assertThat(check.blocking).isNull();
+    assertThat(check.submitImpact).isNull();
     assertThat(check.checkerStatus).isNull();
 
     // Check that at least some non-checker fields are set to ensure that we didn't get a completely
diff --git a/javatests/com/google/gerrit/plugins/checks/acceptance/api/ListChecksIT.java b/javatests/com/google/gerrit/plugins/checks/acceptance/api/ListChecksIT.java
index d21fa3c..d21488f 100644
--- a/javatests/com/google/gerrit/plugins/checks/acceptance/api/ListChecksIT.java
+++ b/javatests/com/google/gerrit/plugins/checks/acceptance/api/ListChecksIT.java
@@ -34,6 +34,7 @@
 import com.google.gerrit.plugins.checks.acceptance.AbstractCheckersTest;
 import com.google.gerrit.plugins.checks.api.CheckInfo;
 import com.google.gerrit.plugins.checks.api.CheckState;
+import com.google.gerrit.plugins.checks.api.CheckSubmitImpactInfo;
 import com.google.gerrit.plugins.checks.api.CheckerStatus;
 import com.google.gson.reflect.TypeToken;
 import com.google.inject.Inject;
@@ -92,12 +93,16 @@
     expectedCheckInfo1.repository = project.get();
     expectedCheckInfo1.checkerName = checkerName1;
     expectedCheckInfo1.blocking = ImmutableSet.of();
+    expectedCheckInfo1.submitImpact = new CheckSubmitImpactInfo();
+    expectedCheckInfo1.submitImpact.required = null;
     expectedCheckInfo1.checkerStatus = CheckerStatus.ENABLED;
 
     CheckInfo expectedCheckInfo2 = checkOperations.check(checkKey2).asInfo();
     expectedCheckInfo2.repository = project.get();
     expectedCheckInfo2.checkerName = checkerName2;
     expectedCheckInfo2.blocking = ImmutableSet.of();
+    expectedCheckInfo2.submitImpact = new CheckSubmitImpactInfo();
+    expectedCheckInfo2.submitImpact.required = null;
     expectedCheckInfo2.checkerStatus = CheckerStatus.ENABLED;
 
     assertThat(checksApiFactory.revision(patchSetId).list(ListChecksOption.CHECKER))
@@ -124,12 +129,16 @@
     expectedCheckInfo1.repository = project.get();
     expectedCheckInfo1.checkerName = checkerName1;
     expectedCheckInfo1.blocking = ImmutableSet.of();
+    expectedCheckInfo1.submitImpact = new CheckSubmitImpactInfo();
+    expectedCheckInfo1.submitImpact.required = null;
     expectedCheckInfo1.checkerStatus = CheckerStatus.ENABLED;
 
     CheckInfo expectedCheckInfo2 = checkOperations.check(checkKey2).asInfo();
     expectedCheckInfo2.repository = project.get();
     expectedCheckInfo2.checkerName = checkerName2;
     expectedCheckInfo2.blocking = ImmutableSet.of();
+    expectedCheckInfo2.submitImpact = new CheckSubmitImpactInfo();
+    expectedCheckInfo2.submitImpact.required = null;
     expectedCheckInfo2.checkerStatus = CheckerStatus.ENABLED;
 
     RestResponse r =
@@ -174,6 +183,7 @@
     CheckInfo check1 = maybeCheck1.get();
     assertThat(check1.checkerName).isEqualTo(checkerName1);
     assertThat(check1.blocking).isEmpty();
+    assertThat(check1.submitImpact).isNotNull();
     assertThat(check1.checkerStatus).isEqualTo(CheckerStatus.ENABLED);
 
     Optional<CheckInfo> maybeCheck2 =
@@ -182,6 +192,7 @@
     CheckInfo check2 = maybeCheck2.get();
     assertThat(check2.checkerName).isNull();
     assertThat(check2.blocking).isNull();
+    assertThat(check2.submitImpact).isNull();
     assertThat(check2.checkerStatus).isNull();
   }
 
diff --git a/javatests/com/google/gerrit/plugins/checks/acceptance/api/UpdateCheckIT.java b/javatests/com/google/gerrit/plugins/checks/acceptance/api/UpdateCheckIT.java
index ba01396..c763abc 100644
--- a/javatests/com/google/gerrit/plugins/checks/acceptance/api/UpdateCheckIT.java
+++ b/javatests/com/google/gerrit/plugins/checks/acceptance/api/UpdateCheckIT.java
@@ -18,6 +18,7 @@
 import static com.google.gerrit.testing.GerritJUnit.assertThrows;
 
 import com.google.gerrit.acceptance.UseClockStep;
+import com.google.gerrit.acceptance.config.GerritConfig;
 import com.google.gerrit.acceptance.testsuite.project.ProjectOperations;
 import com.google.gerrit.acceptance.testsuite.request.RequestScopeOperations;
 import com.google.gerrit.entities.PatchSet;
@@ -98,6 +99,31 @@
   }
 
   @Test
+  public void updateMessage_rejected_tooLong() {
+    CheckInput input = new CheckInput();
+    input.message = new String(new char[10_001]).replace('\0', 'x');
+
+    BadRequestException thrown =
+        assertThrows(
+            BadRequestException.class,
+            () -> checksApiFactory.revision(patchSetId).id(checkKey.checkerUuid()).update(input));
+    assertThat(thrown).hasMessageThat().contains("exceeds size limit (10001 > 10000)");
+  }
+
+  @Test
+  @GerritConfig(name = "plugin.checks.messageSizeLimit", value = "5")
+  public void updateMessage_rejected_configureLimit() {
+    CheckInput input = new CheckInput();
+    input.message = "foobar";
+
+    BadRequestException thrown =
+        assertThrows(
+            BadRequestException.class,
+            () -> checksApiFactory.revision(patchSetId).id(checkKey.checkerUuid()).update(input));
+    assertThat(thrown).hasMessageThat().contains("exceeds size limit (6 > 5)");
+  }
+
+  @Test
   public void unsetMessage() throws Exception {
     checkOperations.check(checkKey).forUpdate().message("some message").upsert();
 
diff --git a/javatests/com/google/gerrit/plugins/checks/acceptance/rules/ChecksSubmitRuleIT.java b/javatests/com/google/gerrit/plugins/checks/acceptance/rules/ChecksSubmitRuleIT.java
index cf8bd67..3e3e1df 100644
--- a/javatests/com/google/gerrit/plugins/checks/acceptance/rules/ChecksSubmitRuleIT.java
+++ b/javatests/com/google/gerrit/plugins/checks/acceptance/rules/ChecksSubmitRuleIT.java
@@ -16,7 +16,6 @@
 
 import static com.google.common.truth.Truth.assertThat;
 
-import com.google.common.collect.ImmutableMap;
 import com.google.gerrit.acceptance.PushOneCommit;
 import com.google.gerrit.entities.PatchSet;
 import com.google.gerrit.extensions.common.ChangeInfo;
@@ -31,8 +30,7 @@
 
 public class ChecksSubmitRuleIT extends AbstractCheckersTest {
   private static final SubmitRequirementInfo SUBMIT_REQUIREMENT_INFO =
-      new SubmitRequirementInfo(
-          "NOT_READY", "All required checks must pass", "checks_pass", ImmutableMap.of());
+      new SubmitRequirementInfo("NOT_READY", "All required checks must pass", "checks_pass");
 
   private String testChangeId;
   private PatchSet.Id testPatchSetId;
diff --git a/javatests/com/google/gerrit/plugins/checks/acceptance/testsuite/CheckOperationsImplTest.java b/javatests/com/google/gerrit/plugins/checks/acceptance/testsuite/CheckOperationsImplTest.java
index b545f99..f68e716 100644
--- a/javatests/com/google/gerrit/plugins/checks/acceptance/testsuite/CheckOperationsImplTest.java
+++ b/javatests/com/google/gerrit/plugins/checks/acceptance/testsuite/CheckOperationsImplTest.java
@@ -81,6 +81,7 @@
     assertThat(foundCheck.checkerName).isNull();
     assertThat(foundCheck.checkerStatus).isNull();
     assertThat(foundCheck.blocking).isNull();
+    assertThat(foundCheck.submitImpact).isNull();
   }
 
   @Test
diff --git a/javatests/com/google/gerrit/plugins/checks/db/CheckerRefMigrationTest.java b/javatests/com/google/gerrit/plugins/checks/db/CheckerRefMigrationTest.java
new file mode 100644
index 0000000..ba80ba9
--- /dev/null
+++ b/javatests/com/google/gerrit/plugins/checks/db/CheckerRefMigrationTest.java
@@ -0,0 +1,98 @@
+// Copyright (C) 2020 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.plugins.checks.db;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import com.google.gerrit.entities.Project;
+import com.google.gerrit.plugins.checks.CheckerUuid;
+import com.google.gerrit.server.config.AllProjectsName;
+import com.google.gerrit.testing.InMemoryRepositoryManager;
+import org.eclipse.jgit.junit.TestRepository;
+import org.eclipse.jgit.lib.Repository;
+import org.junit.Before;
+import org.junit.Test;
+
+public class CheckerRefMigrationTest {
+  private InMemoryRepositoryManager inMemoryRepositoryManager;
+  private AllProjectsName allProjectsName;
+  private Repository allProjectsRepo;
+
+  @Before
+  public void setUp() throws Exception {
+    inMemoryRepositoryManager = new InMemoryRepositoryManager();
+    allProjectsName = new AllProjectsName("Test Repository");
+    allProjectsRepo = inMemoryRepositoryManager.createRepository(allProjectsName);
+  }
+
+  @Test
+  public void migrateLegacyMetaRef() throws Exception {
+    CheckerUuid checkerWithBadRef = CheckerUuid.parse("test:my-checker1");
+    try (TestRepository<Repository> testRepo = new TestRepository<>(allProjectsRepo)) {
+      testRepo
+          .branch("refs/meta/checkers/")
+          .commit()
+          .add(
+              CheckersByRepositoryNotes.computeRepositorySha1(allProjectsName).getName(),
+              checkerWithBadRef.toString())
+          .create();
+    }
+
+    assertThat(allProjectsRepo.exactRef("refs/meta/checkers/")).isNotNull();
+    assertThat(allProjectsRepo.exactRef("refs/meta/checkers")).isNull();
+    CheckerRefMigration checkerRefMigration =
+        new CheckerRefMigration(inMemoryRepositoryManager, allProjectsName);
+    checkerRefMigration.migrate();
+    assertThat(allProjectsRepo.exactRef("refs/meta/checkers")).isNotNull();
+    assertThat(allProjectsRepo.exactRef("refs/meta/checkers/")).isNull();
+  }
+
+  @Test
+  public void readFromLegacyRefUntilMigrated() throws Exception {
+    CheckerUuid checkerUuid = CheckerUuid.parse("test:my-checker1");
+    Project.NameKey projectName = Project.nameKey("foo");
+    // Create a checker map on the legacy ref
+    try (TestRepository<Repository> repo = new TestRepository<>(allProjectsRepo)) {
+      repo.branch("refs/meta/checkers/")
+          .commit()
+          .add(
+              CheckersByRepositoryNotes.computeRepositorySha1(projectName).getName(),
+              checkerUuid.toString())
+          .create();
+    }
+    // Assert that the map gets loaded even though it's on the legacy ref.
+    // This is important to allow for an online migration.
+    assertThat(CheckersByRepositoryNotes.load(allProjectsName, allProjectsRepo).get(projectName))
+        .containsExactly(checkerUuid);
+  }
+
+  @Test
+  public void readFromNewRefWhenMigrated() throws Exception {
+    CheckerUuid checkerUuid = CheckerUuid.parse("test:my-checker1");
+    Project.NameKey projectName = Project.nameKey("foo");
+    // Create a checker map on the new ref
+    try (TestRepository<Repository> repo = new TestRepository<>(allProjectsRepo)) {
+      repo.branch("refs/meta/checkers")
+          .commit()
+          .add(
+              CheckersByRepositoryNotes.computeRepositorySha1(projectName).getName(),
+              checkerUuid.toString())
+          .create();
+    }
+    // Assert that the map gets loaded
+    assertThat(CheckersByRepositoryNotes.load(allProjectsName, allProjectsRepo).get(projectName))
+        .containsExactly(checkerUuid);
+  }
+}
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..aad9f46
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,15857 @@
+{
+  "name": "checks",
+  "requires": true,
+  "lockfileVersion": 1,
+  "dependencies": {
+    "@babel/code-frame": {
+      "version": "7.8.3",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.8.3.tgz",
+      "integrity": "sha512-a9gxpmdXtZEInkCSHUJDLHZVBgb1QS0jhss4cPP93EW7s+uC5bikET2twEF3KV+7rDblJcmNvTR7VJejqd2C2g==",
+      "dev": true,
+      "requires": {
+        "@babel/highlight": "^7.8.3"
+      }
+    },
+    "@babel/helper-validator-identifier": {
+      "version": "7.9.5",
+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.9.5.tgz",
+      "integrity": "sha512-/8arLKUFq882w4tWGj9JYzRpAlZgiWUJ+dtteNTDqrRBz9Iguck9Rn3ykuBDoUwh2TO4tSAJlrxDUOXWklJe4g==",
+      "dev": true
+    },
+    "@babel/highlight": {
+      "version": "7.9.0",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.9.0.tgz",
+      "integrity": "sha512-lJZPilxX7Op3Nv/2cvFdnlepPXDxi29wxteT57Q965oc5R9v86ztx0jfxVrTcBk8C2kcPkkDa2Z4T3ZsPPVWsQ==",
+      "dev": true,
+      "requires": {
+        "@babel/helper-validator-identifier": "^7.9.0",
+        "chalk": "^2.0.0",
+        "js-tokens": "^4.0.0"
+      }
+    },
+    "@bazel/rollup": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/@bazel/rollup/-/rollup-1.6.0.tgz",
+      "integrity": "sha512-MLF7laHX3CSAJH+RbIEVWgnQdz3U8dPkdJWJqiX/z9mUSEgC47LNsMBPKlRy1TpOJOpw1j0vLaJv0qN/bgq9NQ==",
+      "dev": true
+    },
+    "@polymer/iron-test-helpers": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/@polymer/iron-test-helpers/-/iron-test-helpers-3.0.1.tgz",
+      "integrity": "sha512-2R7dnGcW2eg95i7LhYWWUO4AlAk6qXsPnKoyeN2R1t0km0ECMx0jjwqeLwCo8/7LwuVPZSiarI4DK7jyU7fJLQ==",
+      "dev": true,
+      "requires": {
+        "@polymer/polymer": "^3.0.0"
+      }
+    },
+    "@polymer/polymer": {
+      "version": "3.3.1",
+      "resolved": "https://registry.npmjs.org/@polymer/polymer/-/polymer-3.3.1.tgz",
+      "integrity": "sha512-8KaB48tzyMjdsHdxo5KvCAaqmTe7rYDzQAoj/pyEfq9Fp4YfUaS+/xqwYj0GbiDAUNzwkmEQ7dw9cgnRNdKO8A==",
+      "dev": true,
+      "requires": {
+        "@webcomponents/shadycss": "^1.9.1"
+      }
+    },
+    "@types/color-name": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/@types/color-name/-/color-name-1.1.1.tgz",
+      "integrity": "sha512-rr+OQyAjxze7GgWrSaJwydHStIhHq2lvY3BOC2Mj7KnzI7XK0Uw1TOOdI9lDoajEbSWLiYgoo4f1R51erQfhPQ==",
+      "dev": true
+    },
+    "@webcomponents/shadycss": {
+      "version": "1.9.6",
+      "resolved": "https://registry.npmjs.org/@webcomponents/shadycss/-/shadycss-1.9.6.tgz",
+      "integrity": "sha512-5fFjvP0jQJZoXK6YzYeYcIDGJ5oEsdjr1L9VaYLw5yxNd4aRz4srMpwCwldeNG0A6Hvr9igbG7fCsBeiiCXd7A==",
+      "dev": true
+    },
+    "@webcomponents/webcomponentsjs": {
+      "version": "1.3.3",
+      "resolved": "https://registry.npmjs.org/@webcomponents/webcomponentsjs/-/webcomponentsjs-1.3.3.tgz",
+      "integrity": "sha512-eLH04VBMpuZGzBIhOnUjECcQPEPcmfhWEijW9u1B5I+2PPYdWf3vWUExdDxu4Y3GljRSTCOlWnGtS9tpzmXMyQ==",
+      "dev": true
+    },
+    "acorn": {
+      "version": "7.1.1",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.1.1.tgz",
+      "integrity": "sha512-add7dgA5ppRPxCFJoAGfMDi7PIBXq1RtGo7BhbLaxwrXPOmw8gq48Y9ozT01hUKy9byMjlR20EJhu5zlkErEkg==",
+      "dev": true
+    },
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