Speed up custom wallpaper switching time and wallpaper manager code refactor

chrome/browser/chromeos/login/wizard_controller.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_LOGIN_WIZARD_CONTROLLER_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_WIZARD_CONTROLLER_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 70 matching lines @@
 
   // Returns true if valid registration URL is defined.
   static bool IsRegisterScreenDefined();
 
   // Marks device registered. i.e. second part of OOBE is completed.
   static void MarkDeviceRegistered();
 
   // Returns initial locale from local settings.
   static std::string GetInitialLocale();
 
+  // Sets delays to zero. MUST be used only for browser tests.
+  static void SetZeroDelays();
+
   // If true zero delays have been enabled (for browser tests).
   static bool IsZeroDelayEnabled();
 
   // Sets initial locale in local settings.
   static void SetInitialLocale(const std::string& locale);
 
   // Registers OOBE preferences.
   static void RegisterPrefs(PrefService* local_state);
 
   // Marks user image screen to be always skipped after login.
@@ skipping 106 matching lines @@
   // Switches from one screen to another with delay before showing. Calling
   // ShowCurrentScreen directly forces screen to be shown immediately.
   void SetCurrentScreenSmooth(WizardScreen* screen, bool use_smoothing);
 
   // Changes status area visibility.
   void SetStatusAreaVisible(bool visible);
 
   // Logs in the specified user via default login screen.
   void Login(const std::string& username, const std::string& password);
 
-  // Sets delays to zero. MUST be used only for browser tests.
-  static void SetZeroDelays();
-
   static bool skip_user_image_selection_;
 
   static bool zero_delay_enabled_;
 
   // Screens.
   scoped_ptr<NetworkScreen> network_screen_;
   scoped_ptr<UpdateScreen> update_screen_;
   scoped_ptr<UserImageScreen> user_image_screen_;
   scoped_ptr<EulaScreen> eula_screen_;
   scoped_ptr<RegistrationScreen> registration_screen_;
@@ skipping 49 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(WizardControllerFlowTest, Accelerators);
   friend class WizardControllerFlowTest;
   friend class WizardInProcessBrowserTest;
 
   DISALLOW_COPY_AND_ASSIGN(WizardController);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_WIZARD_CONTROLLER_H_