Expand PaintLayer clip to account for hidden URL bar with document.rootScroller

third_party/WebKit/Source/core/paint/PaintLayer.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 262 matching lines @@
     return m_location;
   }
   // FIXME: size() should DCHECK(!m_needsPositionUpdate) as well, but that fails
   // in some tests, for example, fast/repaint/clipped-relative.html.
   const IntSize& size() const { return m_size; }
   void setSizeHackForLayoutTreeAsText(const IntSize& size) { m_size = size; }
 
   LayoutRect rect() const { return LayoutRect(location(), LayoutSize(size())); }
 
   bool isRootLayer() const { return m_isRootLayer; }
+  bool isRootScrollerLayer() const;
 
   PaintLayerCompositor* compositor() const;
 
   // Notification from the layoutObject that its content changed (e.g. current
   // frame of image changed).  Allows updates of layer content without
   // invalidating paint.
   void contentChanged(ContentChangeType);
 
   void updateLayerPosition();
 
@@ skipping 947 matching lines @@
 
 }  // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 CORE_EXPORT void showLayerTree(const blink::PaintLayer*);
 CORE_EXPORT void showLayerTree(const blink::LayoutObject*);
 #endif
 
 #endif  // Layer_h