Basic keyboard access for recently_closed menu on NTP (re-work).

chrome/browser/resources/shared/js/cr/ui/context_menu_handler.js

 // Copyright (c) 2012 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.
 
 cr.define('cr.ui', function() {
 
   /** @const */ var Menu = cr.ui.Menu;
 
   /**
    * Handles context menus.
@@ skipping 21 matching lines @@
     showMenu: function(e, menu) {
       this.menu_ = menu;
       menu.updateCommands(e.currentTarget);
       menu.hidden = false;
       menu.contextElement = e.currentTarget;
 
       // when the menu is shown we steal all keyboard events.
       var doc = menu.ownerDocument;
       doc.addEventListener('keydown', this, true);
       doc.addEventListener('mousedown', this, true);
-      doc.addEventListener('blur', this, true);
+      doc.addEventListener('focus', this, true);
       doc.defaultView.addEventListener('resize', this);
       menu.addEventListener('contextmenu', this);
       menu.addEventListener('activate', this);
       this.positionMenu_(e, menu);
     },
 
     /**
      * Hide the currently shown menu.
      */
     hideMenu: function() {
       var menu = this.menu;
       if (!menu)
         return;
 
       menu.hidden = true;
       menu.contextElement = null;
       var doc = menu.ownerDocument;
       doc.removeEventListener('keydown', this, true);
       doc.removeEventListener('mousedown', this, true);
-      doc.removeEventListener('blur', this, true);
+      doc.removeEventListener('focus', this, true);
       doc.defaultView.removeEventListener('resize', this);
       menu.removeEventListener('contextmenu', this);
       menu.removeEventListener('activate', this);
       menu.selectedIndex = -1;
       this.menu_ = null;
 
       // On windows we might hide the menu in a right mouse button up and if
       // that is the case we wait some short period before we allow the menu
       // to be shown again.
       this.hideTimestamp_ = cr.isWindows ? Date.now() : 0;
@@ skipping 66 matching lines @@
             e.preventDefault();
 
           // If the menu is visible we let it handle all the keyboard events.
           } else if (this.menu) {
             this.menu.handleKeyDown(e);
             e.preventDefault();
             e.stopPropagation();
           }
           break;
 
+        case 'focus':
+          if (!this.menu.contains(e.target))
+            this.hideMenu();
+          break;
+
         case 'activate':
-        case 'blur':
         case 'resize':
           this.hideMenu();
           break;
 
         case 'contextmenu':
           if ((!this.menu || !this.menu.contains(e.target)) &&
               (!this.hideTimestamp_ || Date.now() - this.hideTimestamp_ > 50))
             this.showMenu(e, e.currentTarget.contextMenu);
           e.preventDefault();
           // Don't allow elements further up in the DOM to show their menus.
@@ skipping 72 matching lines @@
    * The singleton context menu handler.
    * @type {!ContextMenuHandler}
    */
   var contextMenuHandler = new ContextMenuHandler;
 
   // Export
   return {
     contextMenuHandler: contextMenuHandler
   };
 });