Move overdraw tracking code from GraphicsContext to CanvasRenderingContext2D

Source/platform/graphics/GraphicsContext.h

Index: Source/platform/graphics/GraphicsContext.h
diff --git a/Source/platform/graphics/GraphicsContext.h b/Source/platform/graphics/GraphicsContext.h
index 934120731552e98e8a80b26a9ca787fe7d24f6a7..0ef3cc1e3b805193a5ef687137507b56eb4bec01 100644
--- a/Source/platform/graphics/GraphicsContext.h
+++ b/Source/platform/graphics/GraphicsContext.h
@@ -61,7 +61,6 @@ class ClipRecorderStack;
 class DisplayItemList;
 class ImageBuffer;
 class KURL;
-class GraphicsContextClient;
 
 class PLATFORM_EXPORT GraphicsContext {
     WTF_MAKE_NONCOPYABLE(GraphicsContext); WTF_MAKE_FAST_ALLOCATED;
@@ -106,10 +105,6 @@ public:
 
     bool hasStroke() const { return strokeStyle() != NoStroke && strokeThickness() > 0; }
 
-    // Returns true if the clip is anything more than an intersection of rectangles
-    bool hasComplexClip() const { return immutableState()->hasComplexClip(); }
-    void setHasComplexClip() { mutableState()->setHasComplexClip(); }
-
     float strokeThickness() const { return immutableState()->strokeData().thickness(); }
     void setStrokeThickness(float thickness) { mutableState()->setStrokeThickness(thickness); }
 
@@ -204,8 +199,6 @@ public:
     bool isAccelerated() const { return m_accelerated; }
     void setAccelerated(bool accelerated) { m_accelerated = accelerated; }
 
-    void setClient(GraphicsContextClient*);
-
     // The text region is empty until tracking is turned on.
     // It is never clerared by the context.
     void setTrackTextRegion(bool track) { m_trackTextRegion = track; }
@@ -470,8 +463,6 @@ private:
     // null indicates painting is contextDisabled. Never delete this object.
     SkCanvas* m_canvas;
 
-    GraphicsContextClient* m_client;
-
     // This being null indicates not to paint into a DisplayItemList, and instead directly into the canvas.
     DisplayItemList* m_displayItemList;