Added HostListApl implementation to connect to legacy directory and GCD.

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';
 
 /** @suppress {duplicate} */
 var remoting = remoting || {};
 
 (function() {
 
 'use strict';
 
 /**
  * @param {!string} hostId
  *
  * TODO(kelvinp):Make fields private and expose them via getters.
  * @constructor
  */
 remoting.Host = function(hostId) {
   /** @const {string} */
   this.hostId = hostId;
   /** @type {string} */
   this.hostName = '';
-  /** @type {string} */
+  /**
+   * Either 'ONLINE' or 'OFFLINE'.
+   * @type {string}
+   */
   this.status = '';
   /** @type {string} */
   this.jabberId = '';
   /** @type {string} */
   this.publicKey = '';
   /** @type {string} */
   this.hostVersion = '';
   /** @type {Array<string>} */
   this.tokenUrlPatterns = [];
   /** @type {string} */
@@ skipping 110 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) > 2;
 };
 
 })();