Merge "Add basic scaffolding for the checks tab"

diff --git a/plugins/replication b/plugins/replication
index 5f5c0d3..b37a255 160000
--- a/plugins/replication
+++ b/plugins/replication

@@ -1 +1 @@
-Subproject commit 5f5c0d372b0006cdee9b880716ffecabe6b29cef
+Subproject commit b37a255e9500dabdf6aa5385b87624a2108f04d3

diff --git a/polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder-side-by-side.ts b/polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder-side-by-side.ts
index efac2b1..1ae302a 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder-side-by-side.ts
+++ b/polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder-side-by-side.ts

@@ -105,7 +105,6 @@
     row.classList.add('diff-row', 'side-by-side');
     row.setAttribute('left-type', leftLine.type);
     row.setAttribute('right-type', rightLine.type);
-    row.tabIndex = -1;
 
     row.appendChild(this._createBlameCell(leftLine.beforeNumber));
 

diff --git a/polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder-unified.ts b/polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder-unified.ts
index c4ea267..04ac472 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder-unified.ts
+++ b/polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder-unified.ts

@@ -104,7 +104,6 @@
   _createRow(line: GrDiffLine) {
     const row = this._createElement('tr', line.type);
     row.classList.add('diff-row', 'unified');
-    row.tabIndex = -1;
     row.appendChild(this._createBlameCell(line.beforeNumber));
     let lineNumberEl = this._createLineEl(
       line,

diff --git a/polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder.ts b/polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder.ts
index f4aa660..75f95f3 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder.ts
+++ b/polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder.ts

@@ -563,6 +563,7 @@
     if (type === GrDiffBuilder.ContextButtonType.ALL) {
       if (this.useNewContextControls) {
         text = `+${numLines} common line`;
+        button.setAttribute('aria-label', `Show ${numLines} common lines`);
       } else {
         text = `Show ${numLines} common line`;
         const icon = this._createElement('iron-icon', 'showContext');
@@ -583,6 +584,7 @@
       if (this.useNewContextControls) {
         text = `+${context}`;
         button.classList.add('aboveButton');
+        button.setAttribute('aria-label', `Show ${context} lines above`);
       } else {
         text = `+${context} above`;
       }
@@ -591,6 +593,7 @@
       if (this.useNewContextControls) {
         text = `+${context}`;
         button.classList.add('belowButton');
+        button.setAttribute('aria-label', `Show ${context} lines below`);
       } else {
         text = `+${context} below`;
       }
@@ -659,6 +662,9 @@
       button.classList.add(side);
       button.dataset['value'] = number.toString();
       button.textContent = number === 'FILE' ? 'File' : number.toString();
+      if (number === 'FILE') {
+        button.setAttribute('aria-label', 'Add file comment');
+      }
 
       // Add aria-labels for valid line numbers.
       // For unified diff, this method will be called with number set to 0 for