Speed up custom wallpaper switching time and wallpaper manager code refactor

chrome/browser/chromeos/login/webui_login_display.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_WEBUI_LOGIN_DISPLAY_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_WEBUI_LOGIN_DISPLAY_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 32 matching lines @@
   // SigninScreenHandlerDelegate implementation:
   virtual gfx::NativeWindow GetNativeWindow() const OVERRIDE;
   virtual void CompleteLogin(const std::string& username,
                              const std::string& password) OVERRIDE;
   virtual void Login(const std::string& username,
                      const std::string& password) OVERRIDE;
   virtual void LoginAsDemoUser() OVERRIDE;
   virtual void LoginAsGuest() OVERRIDE;
   virtual void Signout() OVERRIDE;
   virtual void CreateAccount() OVERRIDE;
-  virtual void UserDeselected() OVERRIDE;
-  virtual void UserSelected(const std::string& username) OVERRIDE;
+  virtual void OnUserDeselected() OVERRIDE;
+  virtual void OnUserSelected(const std::string& username) OVERRIDE;
   virtual void RemoveUser(const std::string& username) OVERRIDE;
   virtual void ShowEnterpriseEnrollmentScreen() OVERRIDE;
   virtual void SetWebUIHandler(
       LoginDisplayWebUIHandler* webui_handler) OVERRIDE;
   virtual void ShowSigninScreenForCreds(const std::string& username,
                                         const std::string& password);
   virtual const UserList& GetUsers() const OVERRIDE;
   virtual bool IsShowGuest() const OVERRIDE;
   virtual bool IsShowUsers() const OVERRIDE;
   virtual bool IsShowNewUser() const OVERRIDE;
@@ skipping 14 matching lines @@
 
   // Reference to the WebUI handling layer for the login screen
   LoginDisplayWebUIHandler* webui_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(WebUILoginDisplay);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_WEBUI_LOGIN_DISPLAY_H_