text: // Copyright 2016 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 CHROMEOS_NETWORK_FAST_TRANSITION_OBSERVER_H_
  #define CHROMEOS_NETWORK_FAST_TRANSITION_OBSERVER_H_
  
  #include <string>
  
  #include "base/component_export.h"
  #include "base/memory/weak_ptr.h"
  #include "components/prefs/pref_change_registrar.h"
  
  class PrefRegistrySimple;
  
  namespace chromeos {
  
  // FastTransitionObserver is a singleton, owned by
  // ChromeBrowserMainPartsChromeos.
  // This class is responsible for propagating Fast Transition policy
  // changes (prefs::kFastTransitionEnabled) in Chrome down to Shill.
  class COMPONENT_EXPORT(CHROMEOS_NETWORK) FastTransitionObserver {
   public:
    explicit FastTransitionObserver(PrefService* local_state);
    ~FastTransitionObserver();
  
    static void RegisterPrefs(PrefRegistrySimple* registry);
  
   private:
    // Callback used when prefs::kFastTransitionEnabled changes
    void OnPreferenceChanged(const std::string& pref_name);
  
    PrefService* local_state_;
    PrefChangeRegistrar pref_change_registrar_;
  
    DISALLOW_COPY_AND_ASSIGN(FastTransitionObserver);
  };
  
  }  // namespace chromeos
  
  #endif  // CHROMEOS_NETWORK_FAST_TRANSITION_OBSERVER_H_
  