mash: Migrate wallpaper controllers to ash/common.

components/wallpaper/wallpaper_resizer.h

 // 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 COMPONENTS_WALLPAPER_WALLPAPER_RESIZER_H_
 #define COMPONENTS_WALLPAPER_WALLPAPER_RESIZER_H_
 
 #include <stdint.h>
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "components/wallpaper/wallpaper_layout.h"
 #include "components/wallpaper/wallpaper_resizer_observer.h"
 #include "skia/ext/image_operations.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/gfx/image/image_skia.h"
 
 namespace base {
-class SequencedWorkerPool;
+class TaskRunner;
 }
 
 namespace wallpaper {
 
 class WallpaperResizerObserver;
 
 // Stores the current wallpaper data and resize it to |target_size| if needed.
 class WALLPAPER_EXPORT WallpaperResizer {
  public:
   // Returns a unique identifier corresponding to |image|, suitable for
   // comparison against the value returned by original_image_id(). If the image
   // is modified, its ID will change.
   static uint32_t GetImageId(const gfx::ImageSkia& image);
 
   WallpaperResizer(const gfx::ImageSkia& image,
                    const gfx::Size& target_size,
                    WallpaperLayout layout,
-                   base::SequencedWorkerPool* worker_pool_ptr);
+                   base::TaskRunner* task_runner);
 
   ~WallpaperResizer();
 
   const gfx::ImageSkia& image() const { return image_; }
   uint32_t original_image_id() const { return original_image_id_; }
   WallpaperLayout layout() const { return layout_; }
-  base::SequencedWorkerPool* worker_pool() const { return worker_pool_; }
 
-  // Called on the UI thread to run Resize() on the worker pool and post an
+  // Called on the UI thread to run Resize() on the task runner 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 |image_| and notifies observers after Resize()
   // has finished running.
   void OnResizeFinished(SkBitmap* resized_bitmap);
 
   base::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 image_;
 
   // Unique identifier corresponding to the original (i.e. pre-resize) |image_|.
   uint32_t original_image_id_;
 
   gfx::Size target_size_;
 
   WallpaperLayout layout_;
 
-  base::SequencedWorkerPool* worker_pool_;
+  base::TaskRunner* task_runner_;
 
   base::WeakPtrFactory<WallpaperResizer> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WallpaperResizer);
 };
 
 }  // namespace wallpaper
 
 #endif  // COMPONENTS_WALLPAPER_WALLPAPER_RESIZER_H_