Enable surprise me wallpaper for new profiles.

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 270 matching lines @@
   // Updates current wallpaper. It may switch the size of wallpaper based on the
   // current display's resolution. (asynchronously with zero delay)
   void UpdateWallpaper();
 
   // Adds given observer to the list.
   void AddObserver(Observer* observer);
 
   // Removes given observer from the list.
   void RemoveObserver(Observer* observer);
 
+  // Enable surprise me wallpaper mode.
+  void EnableSurpriseMe();
+
  private:
   friend class TestApi;
   friend class WallpaperManagerBrowserTest;
   typedef std::map<std::string, gfx::ImageSkia> CustomWallpaperMap;
 
   // Gets encoded wallpaper from cache. Returns true if success.
   bool GetWallpaperFromCache(const std::string& user_id,
                              gfx::ImageSkia* wallpaper);
 
   // The number of wallpapers have loaded. For test only.
@@ skipping 194 matching lines @@
   // All pending will be finally deleted on destroy.
   typedef std::vector<scoped_refptr<PendingWallpaper> > PendingList;
   PendingList loading_;
 
   DISALLOW_COPY_AND_ASSIGN(WallpaperManager);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_WALLPAPER_MANAGER_H_