Implement canvas focus ring methods.

Source/core/html/canvas/CanvasRenderingContext2D.h

 /*
  * Copyright (C) 2006, 2007, 2009, 2010, 2011, 2012 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 30 matching lines @@
 #include "wtf/text/WTFString.h"
 
 namespace WebKit { class WebLayer; }
 
 namespace WebCore {
 
 class CanvasGradient;
 class CanvasPattern;
 class CanvasStyle;
 class DOMPath;
+class Element;
 class FloatRect;
 class GraphicsContext;
 class HTMLCanvasElement;
 class HTMLImageElement;
 class HTMLVideoElement;
 class ImageBitmap;
 class ImageData;
 class TextMetrics;
 
 typedef int ExceptionCode;
@@ skipping 158 matching lines @@
     PassRefPtr<TextMetrics> measureText(const String& text);
 
     LineCap getLineCap() const { return state().m_lineCap; }
     LineJoin getLineJoin() const { return state().m_lineJoin; }
 
     bool webkitImageSmoothingEnabled() const;
     void setWebkitImageSmoothingEnabled(bool);
 
     PassRefPtr<Canvas2DContextAttributes> getContextAttributes() const;
 
+    void drawSystemFocusRing(Element*);
+    bool drawCustomFocusRing(Element*);
+
 private:
     struct State : FontSelectorClient {
         State();
         virtual ~State();
 
         State(const State&);
         State& operator=(const State&);
 
         virtual void fontsNeedUpdate(FontSelector*) OVERRIDE;
 
@@ skipping 75 matching lines @@
     void compositeBuffer(ImageBuffer*, const IntRect&, CompositeOperator);
 
     void inflateStrokeRect(FloatRect&) const;
 
     template<class T> void fullCanvasCompositedFill(const T&);
     template<class T> void fullCanvasCompositedDrawImage(T*, const FloatRect&, const FloatRect&, CompositeOperator);
 
     PassRefPtr<ImageData> getImageData(ImageBuffer::CoordinateSystem, float sx, float sy, float sw, float sh, ExceptionCode&) const;
     void putImageData(ImageData*, ImageBuffer::CoordinateSystem, float dx, float dy, float dirtyX, float dirtyY, float dirtyWidth, float dirtyHeight, ExceptionCode&);
 
+    bool focusRingCallIsValid(const Path&, Element*);
+    void updateFocusRingAccessibility(const Path&, Element*);
+    void drawFocusRing(const Path&, Element*);
+
     virtual bool is2d() const OVERRIDE { return true; }
     virtual bool isAccelerated() const OVERRIDE;
     virtual bool hasAlpha() const OVERRIDE { return m_hasAlpha; }
 
     virtual bool isTransformInvertible() const { return state().m_invertibleCTM; }
 
     virtual WebKit::WebLayer* platformLayer() const OVERRIDE;
 
     Vector<State, 1> m_stateStack;
     unsigned m_unrealizedSaveCount;
     bool m_usesCSSCompatibilityParseMode;
     bool m_hasAlpha;
     MutableStylePropertyMap m_cachedFonts;
 };
 
 } // namespace WebCore
 
 #endif