Return an infinite rect when calling RenderLayerClipper::parentClipRects on the root context layer

Source/core/rendering/RenderLayerClipper.h

 /*
  * Copyright (C) 2003, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Intel Corporation. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
@@ skipping 97 matching lines @@
     // Compute and return the clip rects. If useCached is true, will used previously computed clip rects on ancestors
     // (rather than computing them all from scratch up the parent chain).
     void calculateClipRects(const ClipRectsContext&, ClipRects&) const;
 
 private:
     void parentClipRects(const ClipRectsContext&, ClipRects&) const;
 
     // The layer relative to which clipping rects for this layer are computed.
     RenderLayer* clippingRootForPainting() const;
 
+    bool isClippingRootForContext(const ClipRectsContext&) const;
+
     // FIXME: Could this be a RenderBox?
     RenderLayerModelObject* m_renderer;
     OwnPtr<ClipRectsCache> m_clipRectsCache;
     unsigned m_compositingClipRectsDirty : 1;
 };
 
 } // namespace WebCore
 
 #endif // RenderLayerClipper_h