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diff --git a/chromium/ash/desktop_background/wallpaper_resizer.h b/chromium/ash/desktop_background/wallpaper_resizer.h
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+++ b/chromium/ash/desktop_background/wallpaper_resizer.h
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+// Copyright (c) 2013 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 ASH_DESKTOP_BACKGROUND_DESKTOP_WALLPAPER_RESIZER_H_
+#define ASH_DESKTOP_BACKGROUND_DESKTOP_WALLPAPER_RESIZER_H_
+
+#include "ash/ash_export.h"
+#include "ash/desktop_background/desktop_background_controller.h"
+#include "base/memory/weak_ptr.h"
+#include "base/observer_list.h"
+#include "skia/ext/image_operations.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+#include "ui/gfx/image/image_skia.h"
+#include "ui/gfx/size.h"
+
+namespace ash {
+
+class WallpaperResizerObserver;
+
+// Stores the current wallpaper data and resize it to |target_size| if needed.
+class ASH_EXPORT WallpaperResizer {
+ public:
+  WallpaperResizer(int image_resource_id,
+                   const gfx::Size& target_size,
+                   WallpaperLayout layout);
+
+  WallpaperResizer(const gfx::ImageSkia& image,
+                   const gfx::Size& target_size,
+                   WallpaperLayout layout);
+
+  ~WallpaperResizer();
+
+  const gfx::ImageSkia& wallpaper_image() const { return wallpaper_image_; }
+  const WallpaperLayout layout() const { return layout_; }
+
+  // Called on the UI thread to run Resize() on the worker pool and post an
+  // OnResizeFinished() task back to the UI thread on completion.
+  void StartResize();
+
+  // Add/Remove observers.
+  void AddObserver(WallpaperResizerObserver* observer);
+  void RemoveObserver(WallpaperResizerObserver* observer);
+
+ private:
+  // Copies |resized_bitmap| to |wallpaper_image_| and notifies observers
+  // after Resize() has finished running.
+  void OnResizeFinished(SkBitmap* resized_bitmap);
+
+  ObserverList<WallpaperResizerObserver> observers_;
+
+  // Image that should currently be used for wallpaper. It initially
+  // contains the original image and is updated to contain the resized
+  // image by OnResizeFinished().
+  gfx::ImageSkia wallpaper_image_;
+
+  gfx::Size target_size_;
+
+  WallpaperLayout layout_;
+
+  base::WeakPtrFactory<WallpaperResizer> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(WallpaperResizer);
+};
+
+}  // namespace ash
+
+
+#endif  // ASH_DESKTOP_BACKGROUND_DESKTOP_WALLPAPER_RESIZER_H_