MD History: Update timestamp hover text when item changes

chrome/browser/resources/md_history/history_item.js

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @param {!Element} root
  * @param {?Element} boundary
  * @param {cr.ui.FocusRow.Delegate} delegate
  * @constructor
  * @extends {cr.ui.FocusRow}
@@ skipping 68 matching lines @@
   };
 
   var HistoryItem = Polymer({
     is: 'history-item',
 
     properties: {
       // Underlying HistoryEntry data for this item. Contains read-only fields
       // from the history backend, as well as fields computed by history-list.
       item: {
         type: Object,
-        observer: 'showIcon_',
+        observer: 'itemChanged_',
       },
 
       selected: {
         type: Boolean,
         reflectToAttribute: true,
       },
 
       isCardStart: {
         type: Boolean,
         reflectToAttribute: true,
@@ skipping 196 matching lines @@
 
     onLinkRightClick_: function() {
       md_history.BrowserService.getInstance().recordAction(
           'EntryLinkRightClick');
     },
 
     /**
      * Set the favicon image, based on the URL of the history item.
      * @private
      */
-    showIcon_: function() {
+    itemChanged_: function() {
       this.$.icon.style.backgroundImage = cr.icon.getFavicon(this.item.url);
+      this.listen(this.$['time-accessed'], 'mouseover', 'addTimeTitle_');
     },
 
     /**
      * @param {number} numberOfItems The number of items in the card.
      * @param {string} historyDate Date of the current result.
      * @param {string} search The search term associated with these results.
      * @return {string} The title for this history card.
      * @private
      */
     cardTitle_: function(numberOfItems, historyDate, search) {
@@ skipping 17 matching lines @@
    */
   HistoryItem.searchResultsTitle = function(numberOfResults, searchTerm) {
     var resultId = numberOfResults == 1 ? 'searchResult' : 'searchResults';
     return loadTimeData.getStringF(
         'foundSearchResults', numberOfResults, loadTimeData.getString(resultId),
         searchTerm);
   };
 
   return {HistoryItem: HistoryItem};
 });