Implementing full screen mode for video player in Chrome OS File Browser.

chrome/browser/resources/file_manager/js/image_editor/media_controls.css

 /*
  * Copyright (c) 2012 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.
  */
 
 .media-controls {
   height: 30px;
   border-radius: 5px;
 
@@ skipping 184 matching lines @@
   position: relative;
   height: 100%;
   width: 80px;
 }
 
 .media-controls .fullscreen {
   background-image: url(../../images/mediaplayer_full_screen.png);
   background-position: 4px 4px;
 }
 
-.media-controls .fullscreen.on {
+body:-webkit-full-screen .media-controls .fullscreen {
   background-image: url(../../images/mediaplayer_full_screen_exit.png);
   background-position: 4px 4px;
 }