[MD History] Allow Home and End to scroll the history list.

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 48 matching lines @@
       this.historyItemElement.lastFocused = e.path[0];
     },
 
     /**
      * @override
      * @param {!cr.ui.FocusRow} row The row that detected a keydown.
      * @param {!Event} e
      * @return {boolean} Whether the event was handled.
      */
     onKeydown: function(row, e) {
+      // Allow Home and End to move the history list.
+      if (e.key == 'Home' || e.key == 'End')
+        return true;
+
       // Prevent iron-list from changing the focus on enter.
       if (e.key == 'Enter')
         e.stopPropagation();
 
       return false;
     },
   };
 
   var HistoryItem = Polymer({
     is: 'history-item',
@@ skipping 252 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};
 });