Implement users options handling in login screen.

chrome/browser/chromeos/cros_settings_provider_user.h

Index: chrome/browser/chromeos/cros_settings_provider_user.h
diff --git a/chrome/browser/chromeos/cros_settings_provider_user.h b/chrome/browser/chromeos/cros_settings_provider_user.h
index 0a1792c4d6eb0a0eadde63447231ca6eb86fbd0f..4f74410180fb794545751d818edd62c010aad4dd 100644
--- a/chrome/browser/chromeos/cros_settings_provider_user.h
+++ b/chrome/browser/chromeos/cros_settings_provider_user.h
@@ -9,11 +9,11 @@
 #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 {
 
@@ -23,6 +23,15 @@ class UserCrosSettingsProvider : public CrosSettingsProvider,
   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;
@@ -40,10 +49,9 @@ class UserCrosSettingsProvider : public CrosSettingsProvider,
   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);