Implement user selected wallpaper feature.

ash/desktop_background/desktop_background_controller.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 ASH_DESKTOP_BACKGROUND_DESKTOP_BACKGROUND_CONTROLLER_H_
 #define ASH_DESKTOP_BACKGROUND_DESKTOP_BACKGROUND_CONTROLLER_H_
 #pragma once
 
 #include "ash/ash_export.h"
 #include "ash/desktop_background/desktop_background_resources.h"
@@ skipping 33 matching lines @@
 
   // Get the desktop background mode.
   BackgroundMode desktop_background_mode() const {
     return desktop_background_mode_;
   }
 
   // Load default wallpaper at |index| asynchronously and set to current
   // wallpaper after loaded.
   void SetDefaultWallpaper(int index);
 
+  // Called when user select a file from file system or changed the layout.

[flackr, 2012/05/04 19:06:17]

s/select/selects
s/changed/changes

[bshe, 2012/05/08 22:22:18]

Done.

+  void SetCustomWallpaper(const SkBitmap& wallpaper, WallpaperLayout layout);
+
   // Cancel the current wallpaper loading operation.
   void CancelPendingWallpaperOperation();
 
   // Load logged in user wallpaper asynchronously and set to current wallpaper
   // after loaded.
   void SetLoggedInUserWallpaper();
 
   // Sets the desktop background to solid color mode and create a solid color
   // layout.
   void SetDesktopBackgroundSolidColorMode();
@@ skipping 19 matching lines @@
   scoped_refptr<WallpaperOperation> wallpaper_op_;
 
   base::WeakPtrFactory<DesktopBackgroundController> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DesktopBackgroundController);
 };
 
 }  // namespace ash
 
 #endif  // ASH_DESKTOP_BACKGROUND_DESKTOP_BACKGROUND_CONTROLLER_H_