Fix Jumplist favicons to have high resolution in HDPI Windows displays

ui/gfx/image/image_skia.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/gfx/image/image_skia.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <cmath>
@@ skipping 493 matching lines @@
 #if !defined(OS_WIN)
   CHECK(CanRead());
 #endif
 
   ImageSkiaReps::iterator it = storage_->FindRepresentation(1.0f, true);
   if (it != storage_->image_reps().end())
     return it->sk_bitmap();
   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();
 }
 
 bool ImageSkia::CanModify() const {
   return !storage_.get() || storage_->CanModify();
 }
 
 void ImageSkia::DetachStorageFromThread() {
   if (storage_.get())
     storage_->DetachFromThread();
 }
 
 }  // namespace gfx