Implement host settings migration.

remoting/webapp/crd/js/background.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.
 
 /** @suppress {duplicate} */
 var remoting = remoting || {};
 
 (function(){
 
 'use strict';
 
 /**
  * @constructor
  */
 var BackgroundPage = function() {
   /** @private {remoting.AppLauncher} */
   this.appLauncher_ = null;
   /** @private {remoting.ActivationHandler} */
   this.activationHandler_ = null;
   /** @private {remoting.TelemetryEventWriter.Service} */
   this.telemetryService_ = null;
+  /** @private {remoting.OptionsExporter} */
+  this.optionsExporter_ = null;
   /** @private */
   this.disposables_ = new base.Disposables();
   this.preInit_();
 };
 
 /**
  * Initialize members and globals that are valid throughout the entire lifetime
  * of the background page.
  *
  * @private
@@ skipping 10 matching lines @@
 
   if (base.isAppsV2()) {
     this.appLauncher_ = new remoting.V2AppLauncher();
     this.telemetryService_ = remoting.TelemetryEventWriter.Service.create();
     this.telemetryService_.init();
     this.activationHandler_ = new remoting.ActivationHandler(
         base.Ipc.getInstance(), this.appLauncher_, this.telemetryService_);
     this.disposables_.add(new base.EventHook(
         this.activationHandler_, remoting.ActivationHandler.Events.windowClosed,
         this.telemetryService_.unbindSession.bind(this.telemetryService_)));
+    this.optionsExporter_ = new remoting.OptionsExporter();
   } else {
     this.appLauncher_ = new remoting.V1AppLauncher();
   }
 };
 
 
 window.addEventListener('load', function() {
   remoting.backgroundPage = new BackgroundPage();
 }, false);
 
 }());