Implement apps v2 custom window frame.

remoting/webapp/fullscreen_v2.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
  * Full-screen implementation for apps v2, using chrome.AppWindow.
  */
 
 'use strict';
@@ skipping 84 matching lines @@
 remoting.FullscreenAppsV2.prototype.syncWithMaximize = function(sync) {
   if (sync && chrome.app.window.current().isMaximized()) {
     this.activate(true);
   }
   this.hookingWindowEvents_ = sync;
 };
 
 remoting.FullscreenAppsV2.prototype.onFullscreened_ = function() {
   this.notifyCallbacksOnRestore_ = true;
   this.eventSource_.raiseEvent(this.kEventName_, true);
+  document.body.classList.add('fullscreen');
 };
 
 remoting.FullscreenAppsV2.prototype.onMaximized_ = function() {
   if (this.hookingWindowEvents_) {
     this.activate(true);
   }
 };
 
 remoting.FullscreenAppsV2.prototype.onRestored_ = function() {
+  document.body.classList.remove('fullscreen');
   if (this.hookingWindowEvents_) {
     this.activate(false);
   }
   if (this.notifyCallbacksOnRestore_) {
     this.notifyCallbacksOnRestore_ = false;
     this.eventSource_.raiseEvent(this.kEventName_, false);
   }
 };