Make SVG images for custom CSS cursors appear sharp on retina displays

Source/core/svg/graphics/SVGImage.h

Index: Source/core/svg/graphics/SVGImage.h
===================================================================
--- Source/core/svg/graphics/SVGImage.h	(revision 162906)
+++ Source/core/svg/graphics/SVGImage.h	(working copy)
@@ -41,9 +41,9 @@
 
 class SVGImage : public Image {
 public:
-    static PassRefPtr<SVGImage> create(ImageObserver* observer)
+    static PassRefPtr<SVGImage> create(ImageObserver* observer, float deviceScaleFactor)
     {
-        return adoptRef(new SVGImage(observer));
+        return adoptRef(new SVGImage(observer, deviceScaleFactor));
     }
 
     static bool isInSVGImage(const Element*);
@@ -62,7 +62,7 @@
     virtual void stopAnimation() OVERRIDE;
     virtual void resetAnimation() OVERRIDE;
 
-    virtual PassRefPtr<NativeImageSkia> nativeImageForCurrentFrame() OVERRIDE;
+    virtual PassRefPtr<NativeImageSkia> nativeImageForCurrentFrame(ScaleHint /*hint*/ = UseNativeScale) OVERRIDE;
 
 private:
     friend class AXRenderObject;
@@ -90,7 +90,7 @@
     // FIXME: Implement this to be less conservative.
     virtual bool currentFrameKnownToBeOpaque() OVERRIDE { return false; }
 
-    SVGImage(ImageObserver*);
+    SVGImage(ImageObserver*, float deviceScaleFactor);
     virtual void draw(GraphicsContext*, const FloatRect& fromRect, const FloatRect& toRect, CompositeOperator, blink::WebBlendMode) OVERRIDE;
     void drawForContainer(GraphicsContext*, const FloatSize, float, const FloatRect&, const FloatRect&, CompositeOperator, blink::WebBlendMode);
     void drawPatternForContainer(GraphicsContext*, const FloatSize, float, const FloatRect&, const FloatSize&, const FloatPoint&,
@@ -99,6 +99,7 @@
     OwnPtr<SVGImageChromeClient> m_chromeClient;
     OwnPtr<Page> m_page;
     IntSize m_intrinsicSize;
+    float m_deviceScaleFactor;
 };
 
 inline SVGImage* toSVGImage(Image* image)