Add browser test for CustomizationWallpaperDownloader.

chrome/browser/chromeos/customization_document.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 CHROME_BROWSER_CHROMEOS_CUSTOMIZATION_DOCUMENT_H_
 #define CHROME_BROWSER_CHROMEOS_CUSTOMIZATION_DOCUMENT_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 178 matching lines @@
   static void ShutdownForTesting();
 
   // These methods are also called by WallpaperManager to get "global default"
   // customized wallpaper path (and to init default wallpaper path from it)
   // before first wallpaper is shown.
   static base::FilePath GetCustomizedWallpaperCacheDir();
   static base::FilePath GetCustomizedWallpaperDownloadedFileName();
 
  private:
   friend struct DefaultSingletonTraits<ServicesCustomizationDocument>;
+  friend class CustomizationWallpaperDownloaderBrowserTest;
 
   typedef std::vector<base::WeakPtr<ServicesCustomizationExternalLoader> >
       ExternalLoaders;
 
   // Guard for a single application task (wallpaper downloading, for example).
   class ApplyingTask;
 
   // C-tor for singleton construction.
   ServicesCustomizationDocument();
 
@@ skipping 109 matching lines @@
 
   // Weak factory for callbacks.
   base::WeakPtrFactory<ServicesCustomizationDocument> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ServicesCustomizationDocument);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_CUSTOMIZATION_DOCUMENT_H_