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

remoting/webapp/base/js/host.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
  * The deserialized form of the chromoting host as returned by Apiary.
  */
 
 'use strict';
@@ skipping 81 matching lines @@
           /** @type {remoting.PairingInfo} */ (
               base.getObjectAttr(options, 'pairingInfo', that.pairingInfo));
 
       // Load the key remappings, allowing for either old or new formats.
       var remappings = /** string|!Object */ (options['remapKeys']);
       if (typeof(remappings) === 'string') {
         remappings = remoting.Host.Options.convertRemapKeys(remappings);
       } else if (typeof(remappings) !== 'object') {
         remappings = {};
       }
-      that.remapKeys = remappings;
+      that.remapKeys = /** @type {!Object} */ (base.deepCopy(remappings));
     });
 };
 
 /**
  * Convert an old-style string key remapping into a new-style dictionary one.
  *
  * @param {string} remappings
  * @return {!Object} The same remapping expressed as a dictionary.
  */
 remoting.Host.Options.convertRemapKeys = function(remappings) {
@@ skipping 35 matching lines @@
   var hostMajorVersion = parseInt(host.hostVersion, 10);
   if (isNaN(hostMajorVersion)) {
     // Host versions 26 and higher include the version number in heartbeats,
     // so if it's missing then the host is at most version 25.
     hostMajorVersion = 25;
   }
   return (parseInt(webappVersion, 10) - hostMajorVersion) > 1;
 };
 
 })();