Fix Jumplist favicons to have high resolution in HDPI Windows displays

ui/gfx/image/image_skia.h

Index: ui/gfx/image/image_skia.h
diff --git a/ui/gfx/image/image_skia.h b/ui/gfx/image/image_skia.h
index db7447d986c08a497371523456e372544a5d21be..f3e1bf8fb62981a1621a3c6ac89b0a880d55d2f6 100644
--- a/ui/gfx/image/image_skia.h
+++ b/ui/gfx/image/image_skia.h
@@ -140,6 +140,10 @@ class GFX_EXPORT ImageSkia {
   // TODO(pkotwicz): Return null SkBitmap when the object has no 1x bitmap.
   const SkBitmap* bitmap() const { return &GetBitmap(); }
 
+  // Returns pointer to 2x bitmap contained by this object. If there is no 2x
+  // bitmap, the bitmap whose scale factor is closest to 2x is returned.
+  const SkBitmap* bitmap2x() const { return &GetBitmap2x(); }
+
   // Returns a vector with the image reps contained in this object.
   // There is no guarantee that this will return all images rep for
   // supported scale factors.
@@ -161,6 +165,7 @@ class GFX_EXPORT ImageSkia {
   void Init(const gfx::ImageSkiaRep& image_rep);
 
   const SkBitmap& GetBitmap() const;
+  const SkBitmap& GetBitmap2x() const;
 
   // Checks if the current thread can read/modify the ImageSkia.
   bool CanRead() const;