Allow full-screen mode when not connected, and remember the previous setting.

remoting/webapp/crd/js/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 25 matching lines @@
    * @type {base.EventSource}
    * @private
    */
   this.eventSource_ = new base.EventSource();
   this.eventSource_.defineEvents([this.kEventName_]);
 
   chrome.app.window.current().onFullscreened.addListener(
       this.onFullscreened_.bind(this));
   chrome.app.window.current().onRestored.addListener(
       this.onRestored_.bind(this));
+
+  document.body.classList.toggle('fullscreen', this.isActive());
 };
 
 remoting.FullscreenAppsV2.prototype.activate = function(
     fullscreen, opt_onDone) {
   if (opt_onDone) {
     if (this.isActive() == fullscreen) {
       opt_onDone();
     } else {
       /** @type {remoting.Fullscreen} */
       var that = this;
@@ skipping 40 matching lines @@
   document.body.classList.add('fullscreen');
 };
 
 remoting.FullscreenAppsV2.prototype.onRestored_ = function() {
   document.body.classList.remove('fullscreen');
   if (this.notifyCallbacksOnRestore_) {
     this.notifyCallbacksOnRestore_ = false;
     this.eventSource_.raiseEvent(this.kEventName_, false);
   }
 };