Move Web-facing fullscreen APIs to DocumentFullscreen and ElementFullscreen

Source/core/dom/DocumentFullscreen.h

 /*
  * Copyright (C) 2013, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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  */
 
 #ifndef DocumentFullscreen_h
 #define DocumentFullscreen_h
 
+#include "core/events/EventTarget.h"
+
 namespace blink {
 
 class Document;
 class Element;
 
 class DocumentFullscreen {
 public:
     static bool webkitIsFullScreen(Document&);
     static bool webkitFullScreenKeyboardInputAllowed(Document&);
     static Element* webkitCurrentFullScreenElement(Document&);
 
     static bool webkitFullscreenEnabled(Document&);
     static Element* webkitFullscreenElement(Document&);
     static void webkitExitFullscreen(Document&);
+
+    DEFINE_STATIC_ATTRIBUTE_EVENT_LISTENER(webkitfullscreenchange);
+    DEFINE_STATIC_ATTRIBUTE_EVENT_LISTENER(webkitfullscreenerror);
 };
 
 } // namespace blink
 
 #endif // DocumentFullscreen_h