Added support for enabling GCD, or not, at build time.

remoting/webapp/crd/js/plugin_settings.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.
 
 // Contains all the settings that may need massaging by the build script.
 // Keeping all that centralized here allows us to use symlinks for the other
 // files making for a faster compile/run cycle when only modifying HTML/JS.
 
 'use strict';
 
@@ skipping 23 matching lines @@
 remoting.Settings.prototype.TALK_GADGET_URL = 'TALK_GADGET_URL';
 
 /**
  * @return {string} OAuth2 redirect URI. Note that this needs to be a function
  *     because it gets expanded at compile-time to an expression that involves
  *     a chrome API. Since this file is loaded into the WCS sandbox, which has
  *     no access to these APIs, we can't call it at global scope.
  */
 remoting.Settings.prototype.OAUTH2_REDIRECT_URL = function() {
   return 'OAUTH2_REDIRECT_URL';
-}
+};
 
 /** @type {string} Base URL for the App Remoting API. */
 remoting.Settings.prototype.APP_REMOTING_API_BASE_URL =
     'APP_REMOTING_API_BASE_URL';
 
 /**
  * Return this app's Application ID.
  *
  * This is a function rather than a constant because the build script may
  * replace this string with code to calculate the app id dynamically.
  *
  * @return {string} The Application ID.
  */
 remoting.Settings.prototype.getAppRemotingApplicationId = function() {
   return 'APP_REMOTING_APPLICATION_ID';
 };
 
 /** @type {string} XMPP JID for the remoting directory server bot. */
 remoting.Settings.prototype.DIRECTORY_BOT_JID = 'DIRECTORY_BOT_JID';
 
 // XMPP server connection settings.
 /** @type {string} XMPP server name and port. */
 remoting.Settings.prototype.XMPP_SERVER = 'XMPP_SERVER';
 /** @type {boolean} Whether to use TLS on connections to the XMPP server. */
 remoting.Settings.prototype.XMPP_SERVER_USE_TLS =
-    Boolean('XMPP_SERVER_USE_TLS');
+    !!'XMPP_SERVER_USE_TLS';
 
 // Third party authentication settings.
 /** @type {string} The third party auth redirect URI. */
 remoting.Settings.prototype.THIRD_PARTY_AUTH_REDIRECT_URI =
     'THIRD_PARTY_AUTH_REDIRECT_URL';
 
 // 'native', 'nacl' or 'pnacl'.
 remoting.Settings.prototype.CLIENT_PLUGIN_TYPE = 'CLIENT_PLUGIN_TYPE';
+
+/** @const {boolean} If true, use GCD instead of Chromoting registry. */
+remoting.Settings.prototype.USE_GCD = !!'USE_GCD';