WebUI TaskManager: Delay scripts loading.

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

 // Copyright (c) 2011 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 Menu = cr.ui.Menu;
 
   /**
    * Handles context menus.
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       if (!element.getRectForContextMenu) {
         /**
          * @return {!ClientRect} The rect to use for positioning the context
          *     menu when the context menu is not opened using a mouse position.
          */
         element.getRectForContextMenu = function() {
           return this.getBoundingClientRect();
         };
       }
+    },
+
+    /**
+     * Sets the given contextMenu to the given element. A contextMenu property
+     * would be added if necessary.
+     * @param {!Element} element The element or class to set the contextMenu to.
+     * @param {!cr.ui.Menu} contextMenu The contextMenu property to be set.
+     */
+    setContextMenu: function(element, contextMenu) {
+      if (!element.contextMenu)
+        this.addContextMenuProperty(element);
+      element.contextMenu = contextMenu;
     }
   };
 
   /**
    * The singleton context menu handler.
    * @type {!ContextMenuHandler}
    */
   var contextMenuHandler = new ContextMenuHandler;
 
   // Export
   return {
     contextMenuHandler: contextMenuHandler
   };
 });