Enables HiDPI favicon to be displayed in tab strip on CrOS

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 <algorithm>
 #include <cmath>
 #include <limits>
 
@@ skipping 150 matching lines @@
 }
 
 ImageSkia& ImageSkia::operator=(const SkBitmap& other) {
   Init(ImageSkiaRep(other, ui::SCALE_FACTOR_100P));
   return *this;
 }
 
 ImageSkia::~ImageSkia() {
 }
 
+bool ImageSkia::BackedBySameObjectAs(const gfx::ImageSkia& other) const {
+  return storage_.get() == other.storage_.get();
+}
+
 void ImageSkia::AddRepresentation(const ImageSkiaRep& image_rep) {
   DCHECK(!image_rep.is_null());
 
   if (isNull())
     Init(image_rep);
   else
     storage_->image_reps().push_back(image_rep);
 }
 
 void ImageSkia::RemoveRepresentation(ui::ScaleFactor scale_factor) {
@@ skipping 110 matching lines @@
   if (image_rep.sk_bitmap().empty()) {
     storage_ = NULL;
     return;
   }
   storage_ = new internal::ImageSkiaStorage(
       NULL, gfx::Size(image_rep.GetWidth(), image_rep.GetHeight()));
   storage_->image_reps().push_back(image_rep);
 }
 
 }  // namespace gfx