Move overdraw tracking code from GraphicsContext to CanvasRenderingContext2D

Source/platform/graphics/GraphicsContextState.h

Index: Source/platform/graphics/GraphicsContextState.h
diff --git a/Source/platform/graphics/GraphicsContextState.h b/Source/platform/graphics/GraphicsContextState.h
index 1c5396026b48a92f27709e59922d178f0cb2649c..c505b653fe140b405aa755284ffbe5a0d3d1024f 100644
--- a/Source/platform/graphics/GraphicsContextState.h
+++ b/Source/platform/graphics/GraphicsContextState.h
@@ -141,11 +141,6 @@ public:
     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&);
@@ -189,7 +184,6 @@ private:
 
     bool m_shouldAntialias : 1;
     bool m_shouldClampToSourceRect : 1;
-    bool m_hasComplexClip : 1;
 };
 
 } // namespace blink