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 35 matching lines @@
    */
   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));
   chrome.app.window.current().onMinimized.addListener(
       this.onMinimized_.bind(this));
+
+  document.body.classList.toggle('fullscreen', this.isActive());
 };
 
 /**
  * @param {boolean} fullscreen True to enter full-screen mode; false to leave.
  * @param {function():void=} opt_onDone Optional completion callback.
  */
 remoting.FullscreenAppsV2.prototype.activate = function(
     fullscreen, opt_onDone) {
   if (opt_onDone) {
     if (this.isActive() == fullscreen) {
@@ skipping 71 matching lines @@
 /**
  * @param {boolean} isFullscreen
  * @private
  */
 remoting.FullscreenAppsV2.prototype.raiseEvent_ = function(isFullscreen) {
   if (isFullscreen !== this.previousCallbackState_) {
     this.previousCallbackState_ = isFullscreen;
     this.eventSource_.raiseEvent(this.kEventName_, isFullscreen);
   }
 };