Webkit setting for embedders that do not support fullscreen.

Source/web/WebViewImpl.h

 /*
  * Copyright (C) 2010 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 430 matching lines @@
     void computeScaleAndScrollForFocusedNode(blink::Node* focusedNode, float& scale, blink::IntPoint& scroll, bool& needAnimation);
 
     void animateDoubleTapZoom(const blink::IntPoint&);
 
     void enableFakePageScaleAnimationForTesting(bool);
     bool fakeDoubleTapAnimationPendingForTesting() const { return m_doubleTapZoomPending; }
     blink::IntPoint fakePageScaleAnimationTargetPositionForTesting() const { return m_fakePageScaleAnimationTargetPosition; }
     float fakePageScaleAnimationPageScaleForTesting() const { return m_fakePageScaleAnimationPageScaleFactor; }
     bool fakePageScaleAnimationUseAnchorForTesting() const { return m_fakePageScaleAnimationUseAnchor; }
 
+    bool fullscreenEnabled(blink::Element*);
     void enterFullScreenForElement(blink::Element*);
     void exitFullScreenForElement(blink::Element*);
 
     void clearCompositedSelectionBounds();
 
     // Exposed for the purpose of overriding device metrics.
     void sendResizeEventAndRepaint();
 
     // Exposed for testing purposes.
     bool hasHorizontalScrollbar();
@@ skipping 264 matching lines @@
     bool m_userGestureObserved;
 };
 
 // We have no ways to check if the specified WebView is an instance of
 // WebViewImpl because WebViewImpl is the only implementation of WebView.
 DEFINE_TYPE_CASTS(WebViewImpl, WebView, webView, true, true);
 
 } // namespace blink
 
 #endif