Asynchronously load wallpapers when user pod is selected.

ash/desktop_background/desktop_background_resources.cc

 // 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.
 
 #include "ash/desktop_background/desktop_background_resources.h"
 
 #include "base/logging.h"
 #include "base/rand_util.h"
 #include "grit/ui_resources.h"
 #include "ui/base/resource/resource_bundle.h"
@@ skipping 239 matching lines @@
 
 int GetGuestWallpaperIndex() {
   DCHECK(kGuestWallpaperIndex < kDefaultWallpaperCount);
   return std::min(kGuestWallpaperIndex, kDefaultWallpaperCount - 1);
 }
 
 int GetWallpaperCount() {
   return kDefaultWallpaperCount;
 }
 
-const SkBitmap& GetWallpaper(int index) {
+const WallpaperInfo& GetWallpaperInfo(int index) {
   DCHECK(index >= 0 && index < kDefaultWallpaperCount);
-  return *ui::ResourceBundle::GetSharedInstance().GetImageNamed(
-      kDefaultWallpapers[index].id).ToSkBitmap();
-}
-
-const WallpaperInfo& GetWallpaperInfo(int index) {
   return kDefaultWallpapers[index];
 }
 
 }  // namespace ash