Modifications to DisplayList for better Slimming Paint

Source/core/rendering/svg/RenderSVGResourceClipper.h

 /*
  * Copyright (C) Research In Motion Limited 2009-2010. 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 58 matching lines @@
     virtual RenderSVGResourceType resourceType() const OVERRIDE { return s_resourceType; }
 
     bool hitTestClipContent(const FloatRect&, const FloatPoint&);
 
     SVGUnitTypes::SVGUnitType clipPathUnits() const { return toSVGClipPathElement(element())->clipPathUnits()->currentValue()->enumValue(); }
 
     static const RenderSVGResourceType s_resourceType;
 private:
     bool tryPathOnlyClipping(GraphicsContext*, const AffineTransform&, const FloatRect&);
     void drawClipMaskContent(GraphicsContext*, const FloatRect& targetBoundingBox);
-    PassRefPtr<DisplayList> asDisplayList(GraphicsContext*, const AffineTransform&);
+    void createDisplayList(GraphicsContext*, const AffineTransform&);
     void calculateClipContentPaintInvalidationRect();
 
     RefPtr<DisplayList> m_clipContentDisplayList;
     FloatRect m_clipBoundaries;
 
     // Reference cycle detection.
     bool m_inClipExpansion;
 };
 
 DEFINE_RENDER_SVG_RESOURCE_TYPE_CASTS(RenderSVGResourceClipper, ClipperResourceType);
 
 }
 
 #endif