Fix Jumplist favicons to have high resolution in HDPI Windows displays

ui/gfx/image/image.h

Index: ui/gfx/image/image.h
diff --git a/ui/gfx/image/image.h b/ui/gfx/image/image.h
index 01344242d939a20cb9c6f7ca682104bee1d90d69..1cec7b8729f09a40340995ca17b3925a5e79fd43 100644
--- a/ui/gfx/image/image.h
+++ b/ui/gfx/image/image.h
@@ -115,6 +115,7 @@ class GFX_EXPORT Image {
   // The returned result is a weak pointer owned by and scoped to the life of
   // the Image. Must only be called if IsEmpty() is false.
   const SkBitmap* ToSkBitmap() const;
+  const SkBitmap* ToSkBitmap2x() const;
   const ImageSkia* ToImageSkia() const;
 #if defined(OS_IOS)
   UIImage* ToUIImage() const;
@@ -131,6 +132,9 @@ class GFX_EXPORT Image {
   // Same as ToSkBitmap(), but returns a null SkBitmap if this image is empty.
   SkBitmap AsBitmap() const;
 
+  // Same as ToSkBitmap2x(), but returns a null SkBitmap if this image is empty.
+  SkBitmap AsBitmap2x() const;
+
   // Same as ToImageSkia(), but returns an empty ImageSkia if this
   // image is empty.
   ImageSkia AsImageSkia() const;