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

Source/core/svg/graphics/SVGImage.cpp

Index: Source/core/svg/graphics/SVGImage.cpp
===================================================================
--- Source/core/svg/graphics/SVGImage.cpp	(revision 162906)
+++ Source/core/svg/graphics/SVGImage.cpp	(working copy)
@@ -52,8 +52,9 @@
 
 namespace WebCore {
 
-SVGImage::SVGImage(ImageObserver* observer)
+SVGImage::SVGImage(ImageObserver* observer, float deviceScaleFactor)
     : Image(observer)
+    , m_deviceScaleFactor(deviceScaleFactor)
 {
 }
 
@@ -187,16 +188,20 @@
     draw(context, dstRect, scaledSrc, compositeOp, blendMode);
 }
 
-PassRefPtr<NativeImageSkia> SVGImage::nativeImageForCurrentFrame()
+PassRefPtr<NativeImageSkia> SVGImage::nativeImageForCurrentFrame(ScaleHint hint)
 {
     if (!m_page)
         return 0;
 
-    OwnPtr<ImageBuffer> buffer = ImageBuffer::create(size(), 1);
+    IntSize scaledSize = size();
+    float scale = hint == PreferDeviceScale ? m_deviceScaleFactor : 1;
+    scaledSize.scale(scale);
+
+    OwnPtr<ImageBuffer> buffer = ImageBuffer::create(scaledSize, 1);
     if (!buffer) // failed to allocate image
         return 0;
 
-    drawForContainer(buffer->context(), size(), 1, rect(), rect(), CompositeSourceOver, blink::WebBlendModeNormal);
+    drawForContainer(buffer->context(), size(), 1, FloatRect(IntRect(IntPoint(), scaledSize)), rect(), CompositeSourceOver, blink::WebBlendModeNormal);
 
     // FIXME: WK(Bug 113657): We should use DontCopyBackingStore here.
     return buffer->copyImage(CopyBackingStore)->nativeImageForCurrentFrame();