Reland "Implement random wallpaper feature"

chrome/browser/ui/webui/options2/chromeos/set_wallpaper_options_handler2.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_UI_WEBUI_OPTIONS2_CHROMEOS_SET_WALLPAPER_OPTIONS_HANDLER2_H_
 #define CHROME_BROWSER_UI_WEBUI_OPTIONS2_CHROMEOS_SET_WALLPAPER_OPTIONS_HANDLER2_H_
 
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/ui/webui/options2/options_ui2.h"
 #include "ui/gfx/native_widget_types.h"
@@ skipping 22 matching lines @@
  private:
   // Sends list of available default images to the page.
   void SendDefaultImages();
 
   // Handles page initialized event.
   void HandlePageInitialized(const base::ListValue* args);
 
   // Handles page shown event.
   void HandlePageShown(const base::ListValue* args);
 
-  // Selects one of the available images.
-  void HandleSelectImage(const base::ListValue* args);
+  // Selects one of the available default wallpapers.
+  void HandleDefaultWallpaper(const base::ListValue* args);
+
+  // Sets user wallpaper to a random one from the default wallpapers.
+  void HandleRandomWallpaper(const base::ListValue* args);
 
   // Returns handle to browser window or NULL if it can't be found.
   gfx::NativeWindow GetBrowserWindow() const;
 
   base::WeakPtrFactory<SetWallpaperOptionsHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SetWallpaperOptionsHandler);
 };
 
 }  // namespace options2
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_OPTIONS2_CHROMEOS_SET_WALLPAPER_OPTIONS_HANDLER2_H_