Resize images for hi-dpi based on a custom PNG chunk added by GRIT r78, and roll GRIT r78

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 27 matching lines @@
   typedef std::vector<ImageSkiaRep> ImageSkiaReps;
 
   // Creates an instance with no bitmaps.
   ImageSkia();
 
   // Creates an instance that will use the |source| to get the image
   // for scale factors. |size| specifes the size of the image in DIP.
   // ImageSkia owns |source|.
   ImageSkia(ImageSkiaSource* source, const gfx::Size& size);
 
+  // Creates an instance that uses the |source|. The constructor loads the image
+  // at |scale_factor| and uses its dimensions to calculate the size in DIP.
+  // ImageSkia owns |source|.
+  ImageSkia(ImageSkiaSource* source, ui::ScaleFactor scale_factor);
+
   // Adds ref to passed in bitmap.
   // DIP width and height are set based on scale factor of 1x.
   // TODO(pkotwicz): This is temporary till conversion to gfx::ImageSkia is
   // done.
   ImageSkia(const SkBitmap& bitmap);
 
   explicit ImageSkia(const gfx::ImageSkiaRep& image_rep);
 
   // Copies a reference to |other|'s storage.
   ImageSkia(const ImageSkia& other);
@@ skipping 100 matching lines @@
   // so that other thread can access the storage.
   void DetachStorageFromThread();
 
   // A refptr so that ImageRepSkia can be copied cheaply.
   scoped_refptr<internal::ImageSkiaStorage> storage_;
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_IMAGE_IMAGE_SKIA_H_