Implement SVG masking with slimming paint

Source/platform/graphics/GraphicsContext.h

 /*
  * Copyright (C) 2003, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2008-2009 Torch Mobile, Inc.
  * Copyright (C) 2013 Google 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.
@@ skipping 372 matching lines @@
         return focusRingOutset(offset) + (focusRingWidth(width) + 1) / 2;
     }
 
     // public decl needed for OwnPtr wrapper.
     class RecordingState;
 
 #if ENABLE(ASSERT)
     void setInDrawingRecorder(bool);
 #endif
 
+    static PassRefPtr<SkColorFilter> WebCoreColorFilterToSkiaColorFilter(ColorFilter);
+
 private:
     const GraphicsContextState* immutableState() const { return m_paintState; }
 
     GraphicsContextState* mutableState()
     {
         realizePaintSave();
         return m_paintState;
     }
 
     static void setPathFromPoints(SkPath*, size_t, const FloatPoint*);
     static void setRadii(SkVector*, FloatSize, FloatSize, FloatSize, FloatSize);
 
-    static PassRefPtr<SkColorFilter> WebCoreColorFilterToSkiaColorFilter(ColorFilter);
-
 #if OS(MACOSX)
     static inline int focusRingOutset(int offset) { return offset + 2; }
     static inline int focusRingWidth(int width) { return width; }
 #else
     static inline int focusRingOutset(int offset) { return 0; }
     static inline int focusRingWidth(int width) { return 1; }
     static SkPMColor lineColors(int);
     static SkPMColor antiColors1(int);
     static SkPMColor antiColors2(int);
     static void draw1xMarker(SkBitmap*, int);
@@ skipping 83 matching lines @@
 
     unsigned m_accelerated : 1;
     unsigned m_isCertainlyOpaque : 1;
     unsigned m_printing : 1;
     unsigned m_antialiasHairlineImages : 1;
 };
 
 } // namespace blink
 
 #endif // GraphicsContext_h