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

Source/core/platform/graphics/BitmapImage.h

 /*
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.  All rights reserved.
  * Copyright (C) 2008-2009 Torch Mobile, Inc.
  *
  * 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.
@@ skipping 57 matching lines @@
 
     virtual bool dataChanged(bool allDataReceived) OVERRIDE;
     virtual String filenameExtension() const OVERRIDE;
 
     // It may look unusual that there is no start animation call as public API.  This is because
     // we start and stop animating lazily.  Animation begins whenever someone draws the image.  It will
     // automatically pause once all observers no longer want to render the image anywhere.
     virtual void stopAnimation() OVERRIDE;
     virtual void resetAnimation() OVERRIDE;
 
-    virtual PassRefPtr<NativeImageSkia> nativeImageForCurrentFrame() OVERRIDE;
+    virtual PassRefPtr<NativeImageSkia> nativeImageForCurrentFrame(ScaleHint /*hint*/ = UseNativeScale) OVERRIDE;
     virtual bool currentFrameKnownToBeOpaque() OVERRIDE;
 
     ImageOrientation currentFrameOrientation();
 
 #if !ASSERT_DISABLED
     virtual bool notSolidColor() OVERRIDE;
 #endif
 
 private:
     friend class BitmapImageTest;
@@ skipping 92 matching lines @@
     bool m_allDataReceived : 1; // Whether or not we've received all our data.
     mutable bool m_haveSize : 1; // Whether or not our |m_size| member variable has the final overall image size yet.
     bool m_sizeAvailable : 1; // Whether or not we can obtain the size of the first image frame yet from ImageIO.
     mutable bool m_hasUniformFrameSize : 1;
     mutable bool m_haveFrameCount : 1;
 };
 
 }
 
 #endif