Webkit setting for embedders that do not support fullscreen.

Source/web/FullscreenController.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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 36 matching lines @@
 
 class FullscreenController {
 public:
     static PassOwnPtr<FullscreenController> create(WebViewImpl*);
 
     void willEnterFullScreen();
     void didEnterFullScreen();
     void willExitFullScreen();
     void didExitFullScreen();
 
+    bool fullscreenEnabled(blink::Element*);
     void enterFullScreenForElement(blink::Element*);
     void exitFullScreenForElement(blink::Element*);
 
     bool isFullscreen() { return m_fullScreenFrame; }
 
 protected:
     explicit FullscreenController(WebViewImpl*);
 
 private:
     WebViewImpl* m_webViewImpl;
 
     float m_exitFullscreenPageScaleFactor;
     blink::IntSize m_exitFullscreenScrollOffset;
     blink::FloatPoint m_exitFullscreenPinchViewportOffset;
 
     // If set, the WebView is transitioning to fullscreen for this element.
     RefPtrWillBePersistent<blink::Element> m_provisionalFullScreenElement;
 
     // If set, the WebView is in fullscreen mode for an element in this frame.
     RefPtr<blink::LocalFrame> m_fullScreenFrame;
 
     bool m_isCancelingFullScreen;
 };
 
 }
 
 #endif