Add browser test for CustomizationWallpaperDownloader.

chrome/browser/chromeos/login/wallpaper_manager.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 CHROME_BROWSER_CHROMEOS_LOGIN_WALLPAPER_MANAGER_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_WALLPAPER_MANAGER_H_
 
 #include <deque>
 #include <string>
 #include <vector>
@@ skipping 340 matching lines @@
   // must be writable.
   void SetCustomizedDefaultWallpaper(const GURL& wallpaper_url,
                                      const base::FilePath& downloaded_file,
                                      const base::FilePath& resized_directory);
 
  private:
   friend class TestApi;
   friend class WallpaperManagerBrowserTest;
   friend class WallpaperManagerBrowserTestDefaultWallpaper;
   friend class WallpaperManagerPolicyTest;
+  friend class CustomizationWallpaperDownloaderBrowserTest;
 
   typedef std::map<std::string, gfx::ImageSkia> CustomWallpaperMap;
 
   // Set |wallpaper| controlled by policy.
   void SetPolicyControlledWallpaper(const std::string& user_id,
                                     const UserImage& wallpaper);
 
   // Gets encoded wallpaper from cache. Returns true if success.
   bool GetWallpaperFromCache(const std::string& user_id,
                              gfx::ImageSkia* wallpaper);
@@ skipping 258 matching lines @@
 
   // Current decoded default image is stored in cache.
   scoped_ptr<UserImage> default_wallpaper_image_;
 
   DISALLOW_COPY_AND_ASSIGN(WallpaperManager);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_WALLPAPER_MANAGER_H_