[Chromoting] Create core Application interface for CRD.

remoting/webapp/crd/js/session_connector.js

 // Copyright 2014 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
  * Interface abstracting the SessionConnector functionality.
  */
 
 'use strict';
@@ skipping 86 matching lines @@
  * @param {HTMLElement} clientContainer Container element for the client view.
  * @param {function(remoting.ClientSession):void} onConnected Callback on
  *     success.
  * @param {function(remoting.Error):void} onError Callback on error.
  * @param {function(string, string):boolean} onExtensionMessage The handler for
  *     protocol extension messages. Returns true if a message is recognized;
  *     false otherwise.
  * @return {remoting.SessionConnector}
  */
 remoting.SessionConnectorFactory.prototype.createConnector =
+    // TODO(garykac): Can onExtensionMessage be removed from here? It's only
+    // needed to pass to the ClientSession. Investigate why ClientSession
+    // needs this.
     function(clientContainer, onConnected, onError, onExtensionMessage) {};
 
 /**
  * @type {remoting.SessionConnectorFactory}
  */
 remoting.SessionConnector.factory = null;