Hangout remote desktop part II - background.html and AppLauncher

remoting/webapp/hangout_session.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
  * Class to communicate with the background scripts via chrome runtime
  * messages to
  * 1. Forward session state notifications
  * 2. Closes the window when the session terminates
  */
 
 'use strict';
 
 /** @suppress {duplicate} */
 var remoting = remoting || {};
 
 /**
+ * @param {string} senderId id of the current tab or window.
  * @constructor
  */
-remoting.HangoutSession = function() {
+remoting.HangoutSession = function(senderId) {
   /**
    * @private
-   * @type {chrome.extension.Port}
+   * @type {chrome.runtime.Port}
    */
   this.port_ = null;
+
+  /**
+   * @private
+   * @type {string}
+   */
+  this.senderId_ = senderId;
 };
 
 remoting.HangoutSession.prototype.init = function() {
-  this.port_ = chrome.runtime.connect({name: 'it2me.helper.webapp'});
-
+  var portName = 'it2me.helper.webapp@' + this.senderId_;
+  this.port_ = chrome.runtime.connect({name: portName});
   remoting.hangoutSessionEvents.addEventListener(
       remoting.hangoutSessionEvents.sessionStateChanged,
       this.onSessionStateChanged_.bind(this));
 };
 
 /**
  * @param {remoting.ClientSession.State} state
  */
 remoting.HangoutSession.prototype.onSessionStateChanged_ = function(state) {
   var State = remoting.ClientSession.State;
   try {
     this.port_.postMessage({method: 'sessionStateChanged', state: state});
   } catch (e) {
     // postMessage will throw an exception if the port is disconnected.
     // We can safely ignore this exception.
+    var error = /** @type{Error} */ e;
+    console.error(error);
   } finally {
     if (state === State.FAILED || state === State.CLOSED) {
       // close the current window
       if (remoting.isAppsV2) {
         chrome.app.window.current().close();
       } else {
         window.close();
       }
     }
   }
 };
 
 
 /**
  * remoting.clientSession does not exist until the session is connected.
  * hangoutSessionEvents serves as a global event source to plumb session
  * state changes until we cleanup clientSession and sessionConnector.
  * @type {base.EventSource}
  */
 remoting.hangoutSessionEvents = new base.EventSource();
 
 /** @type {string} */
 remoting.hangoutSessionEvents.sessionStateChanged = "sessionStateChanged";
 
 remoting.hangoutSessionEvents.defineEvents(
     [remoting.hangoutSessionEvents.sessionStateChanged]);