Make table in chrome:site-engagement sortable.

chrome/browser/resources/engagement/engagement_table.html

Index: chrome/browser/resources/engagement/engagement_table.html
diff --git a/chrome/browser/resources/engagement/engagement_table.html b/chrome/browser/resources/engagement/engagement_table.html
index 434ee3d53db56949e048b1ee20c75ae89f9f904e..3b667e8f6e8a1a4f38f2e2e1b6031aa5ceff3984 100644
--- a/chrome/browser/resources/engagement/engagement_table.html
+++ b/chrome/browser/resources/engagement/engagement_table.html
@@ -6,12 +6,18 @@
     <table>
       <thead>
         <tr>
-          <th>Origin</th>
-          <th>Points</th>
+          <th on-tap="handleSortColumnTap" sort-key="origin">
+            Origin
+          </th>
+          <th on-tap="handleSortColumnTap" sort-key="score" class="sort-column">
+            Points
+          </th>
         </tr>
       </thead>
       <tbody>
-        <template is="dom-repeat" items="{{engagementInfo}}" as="info">
+        <template id="engagement-table-items" is="dom-repeat"
+                  items="{{engagementInfo}}" as="info"
+                  sort="[[getTableSortFunction_(sortKey_, sortReverse)]]">
           <tr>
             <td class="origin-cell">{{info.origin}}</td>
             <td>{{info.score}}</td>