Show a helpful error message if a host domain policy blocked an attempt to use

remoting/webapp/remoting.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.
 
 'use strict';
 
 /** @suppress {duplicate} */
 var remoting = remoting || {};
 
 /** @type {remoting.HostSession} */ remoting.hostSession = null;
 
 /**
  * @enum {string} All error messages from messages.json
  */
 remoting.Error = {
   NO_RESPONSE: /*i18n-content*/'ERROR_NO_RESPONSE',
   INVALID_ACCESS_CODE: /*i18n-content*/'ERROR_INVALID_ACCESS_CODE',
   MISSING_PLUGIN: /*i18n-content*/'ERROR_MISSING_PLUGIN',
   AUTHENTICATION_FAILED: /*i18n-content*/'ERROR_AUTHENTICATION_FAILED',
   HOST_IS_OFFLINE: /*i18n-content*/'ERROR_HOST_IS_OFFLINE',
   INCOMPATIBLE_PROTOCOL: /*i18n-content*/'ERROR_INCOMPATIBLE_PROTOCOL',
   BAD_PLUGIN_VERSION: /*i18n-content*/'ERROR_BAD_PLUGIN_VERSION',
   NETWORK_FAILURE: /*i18n-content*/'ERROR_NETWORK_FAILURE',
   HOST_OVERLOAD: /*i18n-content*/'ERROR_HOST_OVERLOAD',
   UNEXPECTED: /*i18n-content*/'ERROR_UNEXPECTED',
   SERVICE_UNAVAILABLE: /*i18n-content*/'ERROR_SERVICE_UNAVAILABLE',
-  NOT_AUTHENTICATED: /*i18n-content*/'ERROR_NOT_AUTHENTICATED'
+  NOT_AUTHENTICATED: /*i18n-content*/'ERROR_NOT_AUTHENTICATED',
+  INVALID_HOST_DOMAIN: /*i18n-content*/'ERROR_INVALID_HOST_DOMAIN'
 };
 
 /**
  * Entry point for app initialization.
  */
 remoting.init = function() {
   remoting.logExtensionInfoAsync_();
   l10n.localize();
   // Create global objects.
   remoting.oauth2 = new remoting.OAuth2();
@@ skipping 271 matching lines @@
  */
 remoting.showErrorMessage = function(error) {
   l10n.localizeElementFromTag(
       document.getElementById('token-refresh-error-message'),
       error);
   var auth_failed = (error == remoting.Error.AUTHENTICATION_FAILED);
   document.getElementById('token-refresh-auth-failed').hidden = !auth_failed;
   document.getElementById('token-refresh-other-error').hidden = auth_failed;
   remoting.setMode(remoting.AppMode.TOKEN_REFRESH_FAILED);
 };