Factor painting code for filters out of FilterEffectRenderer into FilterPainter.

Source/core/rendering/FilterEffectRenderer.h

 /*
  * Copyright (C) 2011 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 33 matching lines @@
 {
     WTF_MAKE_FAST_ALLOCATED;
 public:
     virtual ~FilterEffectRenderer();
     static PassRefPtr<FilterEffectRenderer> create()
     {
         return adoptRef(new FilterEffectRenderer());
     }
 
     bool build(RenderObject* renderer, const FilterOperations&);
-    bool beginFilterEffect(GraphicsContext*, const FloatRect& filterBoxRect);
-    void endFilterEffect(GraphicsContext*);
     void clearIntermediateResults();
 
     PassRefPtr<FilterEffect> lastEffect() const
     {
         return m_lastEffect;
     }
 private:
 
     FilterEffectRenderer();
 
     RefPtr<FilterEffect> m_lastEffect;
     Vector<RefPtr<ReferenceFilter> > m_referenceFilters;
 };
 
 } // namespace blink
 
 
 #endif // FilterEffectRenderer_h