1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef BASE_PREFS_PREF_OBSERVER_H_ 6 #define BASE_PREFS_PREF_OBSERVER_H_ 7 8 #include <string> 9 10 class PrefService; 11 12 // Used internally to the Prefs subsystem to pass preference change 13 // notifications between PrefService, PrefNotifierImpl and 14 // PrefChangeRegistrar. 15 class PrefObserver { 16 public: 17 virtual void OnPreferenceChanged(PrefService* service, 18 const std::string& pref_name) = 0; 19 }; 20 21 #endif // BASE_PREFS_PREF_OBSERVER_H_ 22