Allows arbitrary scale factor in ImageSkia.

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 60 matching lines @@
   // Returns the maximum scale supported by this platform.
   static float GetMaxSupportedScale();
 
   // Creates an image from the passed in bitmap.
   // DIP width and height are based on scale factor of 1x.
   // Adds ref to passed in bitmap.
   // WARNING: The resulting image will be pixelated when painted on a high
   // density display.
   static ImageSkia CreateFrom1xBitmap(const SkBitmap& bitmap);
 
+  // Returns true when ImageSkia looks up the resource pack with the closest
+  // scale factor and rescale the fetched image.
+  static bool IsDSFScalingInImageSkiaEnabled();
+
   // Returns a deep copy of this ImageSkia which has its own storage with
   // the ImageSkiaRep instances that this ImageSkia currently has.
   // This can be safely passed to and manipulated by another thread.
   // Note that this does NOT generate ImageSkiaReps from its source.
   // If you want to create a deep copy with ImageSkiaReps for supported
   // scale factors, you need to explicitly call
   // |EnsureRepsForSupportedScales()| first.
   scoped_ptr<ImageSkia> DeepCopy() const;
 
   // Returns true if this object is backed by the same ImageSkiaStorage as
@@ skipping 75 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_