Move overdraw tracking code from GraphicsContext to CanvasRenderingContext2D

Source/platform/graphics/GraphicsContextState.h

 // 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:
 //
 //    * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //    * Redistributions in binary form must reproduce the above
 // copyright notice, this list of conditions and the following disclaimer
@@ skipping 123 matching lines @@
     // Image interpolation control.
     InterpolationQuality interpolationQuality() const { return m_interpolationQuality; }
     void setInterpolationQuality(InterpolationQuality);
 
     bool shouldAntialias() const { return m_shouldAntialias; }
     void setShouldAntialias(bool);
 
     bool shouldClampToSourceRect() const { return m_shouldClampToSourceRect; }
     void setShouldClampToSourceRect(bool shouldClampToSourceRect) { m_shouldClampToSourceRect = shouldClampToSourceRect; }
 
-    // Returns true if clip is more than just a rectangle or intersection
-    // of rectangles.
-    bool hasComplexClip() const;
-    void setHasComplexClip();
-
 private:
     GraphicsContextState();
     explicit GraphicsContextState(const GraphicsContextState&);
     GraphicsContextState& operator=(const GraphicsContextState&);
 
     // Helper function for applying the state's alpha value to the given input
     // color to produce a new output color.
     SkColor applyAlpha(SkColor color) const
     {
         return multiplyAlpha(color, m_alpha);
@@ skipping 23 matching lines @@
     RefPtr<SkColorFilter> m_colorFilter;
 
     SkXfermode::Mode m_compositeOperation;
 
     InterpolationQuality m_interpolationQuality;
 
     uint16_t m_saveCount;
 
     bool m_shouldAntialias : 1;
     bool m_shouldClampToSourceRect : 1;
-    bool m_hasComplexClip : 1;
 };
 
 } // namespace blink
 
 #endif // GraphicsContextState_h