[Chromoting] Extract shared viewport code into viewport.js.

remoting/webapp/app_remoting/js/app_connected_view.js

 // Copyright 2015 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
  * Implements a basic UX control for a connected app remoting session.
  */
 
 /** @suppress {duplicate} */
@@ skipping 104 matching lines @@
  */
 remoting.AppConnectedView.prototype.onDesktopSizeChanged_ =
     function(hostDesktop) {
   // The first desktop size change indicates that we can close the loading
   // window.
   remoting.LoadingWindow.close();
 
   var hostSize = { width: hostDesktop.width, height: hostDesktop.height };
   var hostDpi = { x: hostDesktop.xDpi, y: hostDesktop.yDpi };
   var clientArea = { width: window.innerWidth, height: window.innerHeight };
-  var newSize = remoting.DesktopViewport.choosePluginSize(
+  var newSize = remoting.Viewport.choosePluginSize(
       clientArea, window.devicePixelRatio,
       hostSize, hostDpi, this.host_.options.desktopScale,
       true /* fullscreen */ , true /* shrinkToFit */ );
 
   this.plugin_.element().style.width = newSize.width + 'px';
   this.plugin_.element().style.height = newSize.height + 'px';
 };
 
 /**
  * @return {Array<string>}
@@ skipping 103 matching lines @@
   ];
   remoting.identity.getNewToken(googleDriveScopes).then(
     function(/** string */ token){
       sendExtensionMessage('accessToken', token);
   }).catch(remoting.Error.handler(function(/** remoting.Error */ error) {
     console.log('Failed to refresh access token: ' + error.toString());
   }));
 };
 
 })();