Speed up custom wallpaper switching time and wallpaper manager code refactor

chrome/browser/ui/webui/chromeos/login/signin_screen_handler.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_CHROMEOS_LOGIN_SIGNIN_SCREEN_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_SIGNIN_SCREEN_HANDLER_H_
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
@@ skipping 63 matching lines @@
   // Sign in into Guest session.
   virtual void LoginAsGuest() = 0;
 
   // Signs out if the screen is currently locked.
   virtual void Signout() = 0;
 
   // Create a new Google account.
   virtual void CreateAccount() = 0;
 
   // Called user pod selection is canceled.
-  virtual void UserDeselected() = 0;
+  virtual void OnUserDeselected() = 0;
 
   // Called when user pod with |username| is selected at login screen.
   // |username| is the email address of the selected user.
-  virtual void UserSelected(const std::string& username) = 0;
+  virtual void OnUserSelected(const std::string& username) = 0;
 
   // Attempts to remove given user.
   virtual void RemoveUser(const std::string& username) = 0;
 
   // Shows Enterprise Enrollment screen.
   virtual void ShowEnterpriseEnrollmentScreen() = 0;
 
   // Let the delegate know about the handler it is supposed to be using.
   virtual void SetWebUIHandler(LoginDisplayWebUIHandler* webui_handler) = 0;
 
@@ skipping 187 matching lines @@
   BrowsingDataRemover* cookie_remover_;
 
   base::WeakPtrFactory<SigninScreenHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SigninScreenHandler);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_SIGNIN_SCREEN_HANDLER_H_