Fix Jumplist favicons to have high resolution in HDPI Windows displays

ui/gfx/image/image_skia.cc

Index: ui/gfx/image/image_skia.cc
diff --git a/ui/gfx/image/image_skia.cc b/ui/gfx/image/image_skia.cc
index fc5cef4761e8ecbec92f66d8aa617c4d3b547c78..1a42ab69ba816a176a37dc48bca30dd0bc04ed51 100644
--- a/ui/gfx/image/image_skia.cc
+++ b/ui/gfx/image/image_skia.cc
@@ -511,6 +511,22 @@ const SkBitmap& ImageSkia::GetBitmap() const {
   return NullImageRep().sk_bitmap();
 }
 
+// TODOs in ImageSkia() also apply to GetBitmap2x().
+const SkBitmap& ImageSkia::GetBitmap2x() const {
+  if (isNull()) {
+    return NullImageRep().sk_bitmap();
+  }
+
+#if !defined(OS_WIN)
+  CHECK(CanRead());
+#endif
+
+  ImageSkiaReps::iterator it = storage_->FindRepresentation(2.0f, true);
+  if (it != storage_->image_reps().end())
+    return it->sk_bitmap();
+  return NullImageRep().sk_bitmap();
+}
+
 bool ImageSkia::CanRead() const {
   return !storage_.get() || storage_->CanRead();
 }