Avoid repainting non needs-self-layout container

Source/core/rendering/LayoutRepainter.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. 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
@@ skipping 12 matching lines @@
  *
  */
 
 #ifndef LayoutRepainter_h
 #define LayoutRepainter_h
 
 #include "platform/geometry/LayoutRect.h"
 
 namespace WebCore {
 
+class RenderBox;
 class RenderLayerModelObject;
 class RenderObject;
 
 class LayoutRepainter {
 public:
     LayoutRepainter(RenderObject&, bool checkForRepaint);
 
     bool checkForRepaint() const { return m_checkForRepaint; }
 
     // Return true if it repainted.
     bool repaintAfterLayout();
 
 private:
+    bool canSkipRepaint() const;
+
     RenderObject& m_object;
     RenderLayerModelObject* m_repaintContainer;
     // We store these values as LayoutRects, but the final invalidations will be pixel snapped
     LayoutRect m_oldBounds;
     LayoutRect m_oldOutlineBox;
     bool m_checkForRepaint;
+
+    LayoutUnit m_logicalWidth;
+    LayoutUnit m_logicalHeight;
+    bool m_selfNeededLayout;
 };
 
 } // namespace WebCore
 
 #endif // LayoutRepainter_h