Enables HiDPI favicon to be displayed in tab strip on CrOS

ui/gfx/image/image_skia.h

 // 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.
 
 #ifndef UI_GFX_IMAGE_IMAGE_SKIA_H_
 #define UI_GFX_IMAGE_IMAGE_SKIA_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 49 matching lines @@
   // done.
   ImageSkia& operator=(const SkBitmap& other);
 
   // Converts to gfx::ImageSkiaRep and SkBitmap.
   // TODO(pkotwicz): This is temporary till conversion to gfx::ImageSkia is
   // done.
   operator SkBitmap&() const;
 
   ~ImageSkia();
 
+  // Returns true if this object is backed by the same ImageSkiaStorage as
+  // |other|. Will also return true if both images are isNull().
+  bool BackedBySameObjectAs(const gfx::ImageSkia& other) const;
+
   // Adds |image_rep| to the image reps contained by this object.
   void AddRepresentation(const gfx::ImageSkiaRep& image_rep);
 
   // Removes the image rep of |scale_factor| if present.
   void RemoveRepresentation(ui::ScaleFactor scale_factor);
 
   // Returns true if the object owns an image rep whose density matches
   // |scale_factor| exactly.
   bool HasRepresentation(ui::ScaleFactor scale_factor) const;
 
@@ skipping 47 matching lines @@
   // If the image rep's bitmap is empty, ImageStorage is set to NULL.
   void Init(const gfx::ImageSkiaRep& image_rep);
 
   // A refptr so that ImageRepSkia can be copied cheaply.
   scoped_refptr<internal::ImageSkiaStorage> storage_;
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_IMAGE_IMAGE_SKIA_H_