Webkit setting for embedders that do not support fullscreen.

Source/core/page/ChromeClient.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple, Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  * Copyright (C) 2012 Samsung Electronics. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 165 matching lines @@
 
     // Asychronous request to enumerate all files in a directory chosen by the user.
     virtual void enumerateChosenDirectory(FileChooser*) = 0;
 
     // Allows ports to customize the type of graphics layers created by this page.
     virtual GraphicsLayerFactory* graphicsLayerFactory() const { return 0; }
 
     // Pass 0 as the GraphicsLayer to detatch the root layer.
     virtual void attachRootGraphicsLayer(GraphicsLayer*) = 0;
 
+    virtual bool fullscreenEnabled(Element*) = 0;
     virtual void enterFullScreenForElement(Element*) { }
     virtual void exitFullScreenForElement(Element*) { }
 
     virtual void clearCompositedSelectionBounds() { }
 
     virtual void needTouchEvents(bool) = 0;
 
     virtual void setTouchAction(TouchAction) = 0;
 
     // Checks if there is an opened popup, called by RenderMenuList::showPopup().
@@ skipping 37 matching lines @@
     virtual void willSetInputMethodState() { }
     virtual void didUpdateTextOfFocusedElementByNonUserInput() { }
     virtual void showImeIfNeeded() { }
 
 protected:
     virtual ~ChromeClient() { }
 };
 
 }
 #endif // ChromeClient_h