Use a #fefefe solid color wallpaper background before user login for GAIA login flow

chrome/browser/chromeos/login/mock_user_manager.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_MOCK_USER_MANAGER_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_MOCK_USER_MANAGER_H_
 #pragma once
 
 #include <string>
 
 #include "base/file_path.h"
 #include "chrome/browser/chromeos/login/user_manager.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 namespace chromeos {
 
 class MockUserManager : public UserManager {
  public:
   MockUserManager();
   virtual ~MockUserManager();
 
   MOCK_CONST_METHOD0(GetUsers, const UserList&(void));
   MOCK_METHOD1(UserLoggedIn, void(const std::string&));
   MOCK_METHOD0(DemoUserLoggedIn, void(void));
   MOCK_METHOD0(GuestUserLoggedIn, void(void));
   MOCK_METHOD1(EphemeralUserLoggedIn, void(const std::string&));
-  MOCK_METHOD0(SetLoggedInUserWallpaper, void(void));
+  MOCK_METHOD0(InitializeWallpaper, void(void));
   MOCK_METHOD1(UserSelected, void(const std::string&));
   MOCK_METHOD0(SessionStarted, void(void));
   MOCK_METHOD2(RemoveUser, void(const std::string&, RemoveUserDelegate*));
   MOCK_METHOD1(RemoveUserFromList, void(const std::string&));
   MOCK_CONST_METHOD1(IsKnownUser, bool(const std::string&));
   MOCK_CONST_METHOD1(FindUser, const User*(const std::string&));
   MOCK_METHOD2(SaveUserOAuthStatus, void(const std::string&,
                                          User::OAuthTokenStatus));
   MOCK_METHOD2(SaveUserDisplayName, void(const std::string&,
                                          const string16&));
@@ skipping 54 matching lines @@
   MockUserManager* user_manager();
 
  private:
   UserManager* old_user_manager_;
   scoped_ptr<MockUserManager> user_manager_;
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_MOCK_USER_MANAGER_H_