Load user custom wallpaper after browser crash.

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"
 #include "base/basictypes.h"
 #include "base/memory/weak_ptr.h"
 
 namespace aura {
 class RootWindow;
 }
 
 namespace gfx {
 class ImageSkia;
 }
 
 namespace ash {
 
 class UserWallpaperDelegate {
  public:
   virtual ~UserWallpaperDelegate() {}
 
-  // Gets the index of user selected wallpaper.
-  virtual const int GetUserWallpaperIndex() = 0;
+  // Loads logged in user wallpaper asynchronously and sets to current wallpaper
+  // after loaded.
+  virtual void SetLoggedInUserWallpaper() = 0;
 
   // Opens the set wallpaper page in the browser.
   virtual void OpenSetWallpaperPage() = 0;
 
   // Returns true if user can open set wallpaper page. Only guest user returns
   // false currently.
   virtual bool CanOpenSetWallpaperPage() = 0;
 };
 
 // Loads selected desktop wallpaper from file system asynchronously and updates
@@ skipping 18 matching lines @@
   void SetDefaultWallpaper(int index);
 
   // Sets the user selected custom wallpaper. Called when user selected a file
   // from file system or changed the layout of wallpaper.
   void SetCustomWallpaper(const gfx::ImageSkia& wallpaper,
                           WallpaperLayout layout);
 
   // Cancels the current wallpaper loading operation.
   void CancelPendingWallpaperOperation();
 
-  // Loads logged in user wallpaper asynchronously and sets to current wallpaper
-  // after loaded.
-  void SetLoggedInUserWallpaper();
-
   // Sets the desktop background to solid color mode and creates a solid color
   // layout.
   void SetDesktopBackgroundSolidColorMode();
 
+  // Creates an empty wallpaper. Some tests require a wallpaper widget is ready
+  // when running. However, the wallpaper widgets are now created asynchronously
+  // . If loading a real wallpaper, there are cases that these tests crash
+  // because the required widget is not ready. This function synchronously
+  // creates an empty widget for those tests to prevent crashes. An example test
+  // is SystemGestureEventFilterTest.ThreeFingerSwipe.
+  void CreateEmptyWallpaper();
+
  private:
   // An operation to asynchronously loads wallpaper.
   class WallpaperOperation;
 
   // Sets the desktop background to image mode and creates a new background
   // widget with user selected wallpaper or default wallpaper. Deletes the old
   // widget if any.
   void SetDesktopBackgroundImageMode(scoped_refptr<WallpaperOperation> wo);
 
   // Creates a new background widget and sets the background mode to image mode.
   // Called after wallpaper loaded successfully.
   void OnWallpaperLoadCompleted(scoped_refptr<WallpaperOperation> wo);
 
-  // Creates an empty wallpaper. Some tests require a wallpaper widget is ready
-  // when running. However, the wallpaper widgets are now created asynchronously
-  // . If loading a real wallpaper, there are cases that these tests crash
-  // because the required widget is not ready. This function synchronously
-  // creates an empty widget for those tests to prevent crashes. An example test
-  // is SystemGestureEventFilterTest.ThreeFingerSwipe.
-  void CreateEmptyWallpaper();
-
   aura::RootWindow* root_window_;
 
   // Can change at runtime.
   BackgroundMode desktop_background_mode_;
 
   // The previous successfully loaded wallpaper.
   int previous_index_;
 
   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_