Add a menu option for the right-hand Ctrl -> Meta mapping.

remoting/webapp/crd/js/toolbar.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.
 
 /**
  * @fileoverview
  * Class representing the client tool-bar.
  */
 
 'use strict';
@@ skipping 50 matching lines @@
 };
 
 
 /**
  * @return {remoting.OptionsMenu}
  */
 remoting.Toolbar.prototype.createOptionsMenu = function() {
   return new remoting.OptionsMenu(
       document.getElementById('send-ctrl-alt-del'),
       document.getElementById('send-print-screen'),
+      document.getElementById('map-right-ctrl-to-meta'),
       document.getElementById('screen-resize-to-client'),
       document.getElementById('screen-shrink-to-fit'),
       document.getElementById('new-connection'),
       document.getElementById('toggle-full-screen'),
       null,
       null);
 };
 
 /**
  * Preview the tool-bar functionality by showing it for 3s.
@@ skipping 89 matching lines @@
   remoting.optionsMenu.onShow();
 };
 
 /** @type {remoting.Toolbar} */
 remoting.toolbar = null;
 
 /** @private */
 remoting.Toolbar.STUB_EXTENDED_CLASS_ = 'toolbar-stub-extended';
 /** @private */
 remoting.Toolbar.VISIBLE_CLASS_ = 'toolbar-visible';