Interfaceify ClientPlugin in preparation for mocking it.

remoting/webapp/client_screen.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
  * Functions related to the 'client screen' for Chromoting.
  */
 
 'use strict';
 
 /** @suppress {duplicate} */
 var remoting = remoting || {};
 
 /**
- * @type {remoting.SessionConnector} The connector object, set when a connection
- *     is initiated.
+ * @type {remoting.SessionConnector} The connector object, set when a
+ *     connection is initiated.
  */
 remoting.connector = null;
 
 /**
  * @type {remoting.ClientSession} The client session object, set once the
  *     connector has invoked its onOk callback.
  */
 remoting.clientSession = null;
 
 /**
@@ skipping 245 matching lines @@
         event.preventDefault();
 
         // Set the focus away from the password field. This has to be done
         // before the password field gets hidden, to work around a Blink
         // clipboard-handling bug - http://crbug.com/281523.
         document.getElementById('pin-connect-button').focus();
 
         remoting.setMode(remoting.AppMode.CLIENT_CONNECTING);
         onPinFetched(pin);
         if (/** @type {boolean} */(rememberPinCheckbox.checked)) {
-          remoting.connector.pairingRequested = true;
+          /** @type {boolean} */
+          remoting.pairingRequested = true;
         }
       } else {
         remoting.setMode(remoting.AppMode.HOME);
       }
     };
     pinForm.addEventListener('submit', onSubmitOrCancel, false);
     pinCancel.addEventListener('click', onSubmitOrCancel, false);
     rememberPin.hidden = !supportsPairing;
     rememberPinCheckbox.checked = false;
     var message = document.getElementById('pin-message');
@@ skipping 27 matching lines @@
   document.getElementById('access-code-entry').value = '';
   remoting.setMode(remoting.AppMode.IN_SESSION);
   remoting.toolbar.center();
   remoting.toolbar.preview();
   remoting.clipboard.startSession();
   updateStatistics_();
   remoting.hangoutSessionEvents.raiseEvent(
       remoting.hangoutSessionEvents.sessionStateChanged,
       remoting.ClientSession.State.CONNECTED
   );
-  if (remoting.connector.pairingRequested) {
+  if (remoting.pairingRequested) {
     /**
      * @param {string} clientId
      * @param {string} sharedSecret
      */
     var onPairingComplete = function(clientId, sharedSecret) {
       var pairingInfo = {
         pairingInfo: {
           clientId: clientId,
           sharedSecret: sharedSecret
         }
@@ skipping 33 matching lines @@
     return remoting.clientSession.handleExtensionMessage(type, data);
   }
   return false;
 };
 
 /**
  * Create a session connector if one doesn't already exist.
  */
 remoting.ensureSessionConnector_ = function() {
   if (!remoting.connector) {
-    remoting.connector = new remoting.SessionConnector(
+    remoting.connector = remoting.SessionConnector.factory.createConnector(
         document.getElementById('video-container'),
         remoting.onConnected,
         showConnectError_, remoting.onExtensionMessage);
   }
 };