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

Source/core/fetch/ImageResource.h

Index: Source/core/fetch/ImageResource.h
===================================================================
--- Source/core/fetch/ImageResource.h	(revision 162906)
+++ Source/core/fetch/ImageResource.h	(working copy)
@@ -65,6 +65,7 @@
     bool usesImageContainerSize() const;
     bool imageHasRelativeWidth() const;
     bool imageHasRelativeHeight() const;
+    void setDeviceScaleFactor(float scale) { m_deviceScaleFactor = scale; }
     // The device pixel ratio we got from the server for this image, or 1.0.
     float devicePixelRatioHeaderValue() const { return m_devicePixelRatioHeaderValue; }
     bool hasDevicePixelRatioHeaderValue() const { return m_hasDevicePixelRatioHeaderValue; }
@@ -120,6 +121,7 @@
     typedef HashMap<const ImageResourceClient*, SizeAndZoom> ContainerSizeRequests;
     ContainerSizeRequests m_pendingContainerSizeRequests;
     float m_devicePixelRatioHeaderValue;
+    float m_deviceScaleFactor;
 
     RefPtr<WebCore::Image> m_image;
     OwnPtr<SVGImageCache> m_svgImageCache;