Show user information above search results when searching for an owner

Change-Id: Ib4beb40ad9a24500bbd81f35aef244b12aa868ac
diff --git a/polygerrit-ui/app/elements/change-list/gr-user-header/gr-user-header.js b/polygerrit-ui/app/elements/change-list/gr-user-header/gr-user-header.js
new file mode 100644
index 0000000..dd3512a
--- /dev/null
+++ b/polygerrit-ui/app/elements/change-list/gr-user-header/gr-user-header.js
@@ -0,0 +1,68 @@
+// Copyright (C) 2017 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.
+(function() {
+  'use strict';
+
+  Polymer({
+    is: 'gr-user-header',
+    properties: {
+      /** @type {?String} */
+      userId: {
+        type: String,
+        observer: '_accountChanged',
+      },
+
+      /**
+       * @type {?{name: ?, email: ?, registered_on: ?}}
+       */
+      _accountDetails: {
+        type: Object,
+        value: null,
+      },
+
+      /** @type {?String} */
+      _status: {
+        type: String,
+        value: null,
+      },
+    },
+
+    _accountChanged(userId) {
+      if (!userId) {
+        this._accountDetails = null;
+        this._status = null;
+        return;
+      }
+
+      this.$.restAPI.getAccountDetails(userId).then(details => {
+        this._accountDetails = details;
+      });
+      this.$.restAPI.getAccountStatus(userId).then(status => {
+        this._status = status;
+      });
+    },
+
+    _computeDisplayClass(status) {
+      return status ? ' ' : 'hide';
+    },
+
+    _computeDetail(accountDetails, name) {
+      return accountDetails ? accountDetails[name] : '';
+    },
+
+    _computeStatusClass(accountDetails) {
+      return this._computeDetail(accountDetails, 'status') ? '' : 'hide';
+    },
+  });
+})();