MD History: Focus item checkbox when selecting/deselecting on click

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 167 matching lines @@
         var elem = e.path[i];
         if (elem.id != 'checkbox' &&
             (elem.nodeName == 'A' || elem.nodeName == 'BUTTON')) {
           return;
         }
       }
 
       if (this.selectionNotAllowed_())
         return;
 
+      this.$.checkbox.focus();
       this.fire('history-checkbox-select', {
         element: this,
         shiftKey: e.shiftKey,
       });
     },
 
     /**
      * @param {MouseEvent} e
      * @private
      */
@@ skipping 149 matching lines @@
    * @return {string} The title for a page of search results.
    */
   HistoryItem.searchResultsTitle = function(numberOfResults, searchTerm) {
     var resultId = numberOfResults == 1 ? 'searchResult' : 'searchResults';
     return loadTimeData.getStringF('foundSearchResults', numberOfResults,
         loadTimeData.getString(resultId), searchTerm);
   };
 
   return { HistoryItem: HistoryItem };
 });