Implement users options handling in login screen.

chrome/browser/chromeos/cros_settings_provider_user.h

 // Copyright (c) 2010 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_CROS_SETTINGS_PROVIDER_USER_H_
 #define CHROME_BROWSER_CHROMEOS_CROS_SETTINGS_PROVIDER_USER_H_
 #pragma once
 
 #include <string>
 
 #include "base/basictypes.h"
-#include "base/scoped_ptr.h"
 #include "chrome/browser/chromeos/cros_settings_provider.h"
 #include "chrome/browser/chromeos/login/signed_settings_helper.h"
 
-class DictionaryValue;
+class ListValue;
+class PrefService;
 
 namespace chromeos {
 
 class UserCrosSettingsProvider : public CrosSettingsProvider,
                                  public SignedSettingsHelper::Callback {
  public:
   UserCrosSettingsProvider();
   virtual ~UserCrosSettingsProvider();
 
+  // Registers cached users settings in preferences.
+  static void RegisterPrefs(PrefService* local_state);
+
+  // Helper functions to access cached settings.
+  static bool cached_allow_bwsi();
+  static bool cached_allow_guest();
+  static bool cached_show_users_on_signin();
+  static const ListValue* cached_whitelist();
+
   // CrosSettingsProvider implementation.
   virtual void Set(const std::string& path, Value* in_value);
   virtual bool Get(const std::string& path, Value** out_value) const;
   virtual bool HandlesSetting(const std::string& path);
 
   // SignedSettingsHelper::Callback overrides.
   virtual void OnWhitelistCompleted(bool success, const std::string& email);
   virtual void OnUnwhitelistCompleted(bool success, const std::string& email);
   virtual void OnStorePropertyCompleted(
       bool success, const std::string& name, const std::string& value);
   virtual void OnRetrievePropertyCompleted(
       bool success, const std::string& name, const std::string& value);
 
   void WhitelistUser(const std::string& email);
   void UnwhitelistUser(const std::string& email);
 
  private:
-  void StartFetchingBoolSetting(const std::string& name, bool default_value);
-  void LoadUserWhitelist();
+  void StartFetchingBoolSetting(const std::string& name);
+  ListValue* GetUserWhitelist() const;
 
-  scoped_ptr<DictionaryValue> cache_;
   bool current_user_is_owner_;
 
   DISALLOW_COPY_AND_ASSIGN(UserCrosSettingsProvider);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_CROS_SETTINGS_PROVIDER_USER_H_