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

Source/core/platform/graphics/Image.h

 /*
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2004, 2005, 2006 Apple Computer, 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
@@ skipping 89 matching lines @@
     virtual void startAnimation(bool /*catchUpIfNecessary*/ = true) { }
     virtual void stopAnimation() {}
     virtual void resetAnimation() {}
 
     // Typically the ImageResource that owns us.
     ImageObserver* imageObserver() const { return m_imageObserver; }
     void setImageObserver(ImageObserver* observer) { m_imageObserver = observer; }
 
     enum TileRule { StretchTile, RoundTile, SpaceTile, RepeatTile };
 
-    virtual PassRefPtr<NativeImageSkia> nativeImageForCurrentFrame() { return 0; }
+    enum ScaleHint {
+        UseNativeScale,
+        PreferDeviceScale
+    };
+
+    virtual PassRefPtr<NativeImageSkia> nativeImageForCurrentFrame(ScaleHint /*hint*/ = UseNativeScale) { return 0; }
 
     virtual void drawPattern(GraphicsContext*, const FloatRect&,
         const FloatSize&, const FloatPoint& phase, CompositeOperator,
         const FloatRect&, blink::WebBlendMode = blink::WebBlendModeNormal, const IntSize& repeatSpacing = IntSize());
 
 #if !ASSERT_DISABLED
     virtual bool notSolidColor() { return true; }
 #endif
 
 protected:
@@ skipping 13 matching lines @@
     virtual Color solidColor() const { return Color(); }
 
 private:
     RefPtr<SharedBuffer> m_encodedImageData;
     ImageObserver* m_imageObserver;
 };
 
 }
 
 #endif