Separate host desktop related functionality into remoting.HostDesktop

remoting/webapp/crd/js/client_session.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 handling creation and teardown of a remoting client session.
  *
  * The ClientSession class controls lifetime of the client plugin
  * object and provides the plugin with the functionality it needs to
@@ skipping 226 matching lines @@
  * @enum {string}
  */
 remoting.ClientSession.Capability = {
   // When enabled this capability causes the client to send its screen
   // resolution to the host once connection has been established. See
   // this.plugin_.notifyClientResolution().
   SEND_INITIAL_RESOLUTION: 'sendInitialResolution',
 
   // Let the host know that we're interested in knowing whether or not it
   // rate limits desktop-resize requests.
+  // TODO(kelvinp): This has been supported since M-29.  Currently we only have
+  // <1000 users on M-29 or below. Remove this and the capability on the host.
   RATE_LIMIT_RESIZE_REQUESTS: 'rateLimitResizeRequests',
 
   // Indicates that host/client supports Google Drive integration, and that the
   // client should send to the host the OAuth tokens to be used by Google Drive
   // on the host.
   GOOGLE_DRIVE: "googleDrive",
 
   // Indicates that the client supports the video frame-recording extension.
   VIDEO_RECORDER: 'videoRecorder',
 
@@ skipping 583 matching lines @@
  * @param {Object} message The parsed extension message data.
  * @return {boolean} True if the message was recognized, false otherwise.
  */
 remoting.ClientSession.prototype.handleExtensionMessage =
     function(type, message) {
   if (this.uiHandler_.handleExtensionMessage(type, message)) {
     return true;
   }
   return false;
 };