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 CHROME_BROWSER_CHROMEOS_NET_NETWORK_THROTTLING_OBSERVER_H_
  #define CHROME_BROWSER_CHROMEOS_NET_NETWORK_THROTTLING_OBSERVER_H_
  
  #include <string>
  
  #include "base/memory/weak_ptr.h"
  #include "components/prefs/pref_change_registrar.h"
  
  class PrefRegistrySimple;
  
  namespace chromeos {
  
  // NetworkThrottlingObserver is a singleton, owned by
  // ChromeBrowserMainPartsChromeos.
  // This class is responsible for propagating network bandwidth throttling policy
  // changes (prefs::kNetworkThrottlingEnabled) in Chrome down to Shill which
  // implements by calling 'tc' in the kernel.
  class NetworkThrottlingObserver {
   public:
    explicit NetworkThrottlingObserver(PrefService* local_state);
    ~NetworkThrottlingObserver();
  
    static void RegisterPrefs(PrefRegistrySimple* registry);
  
   private:
    // Callback used when prefs::kNetworkThrottlingEnabled changes
    void OnPreferenceChanged(const std::string& pref_name);
  
    PrefService* local_state_;
    PrefChangeRegistrar pref_change_registrar_;
  
    DISALLOW_COPY_AND_ASSIGN(NetworkThrottlingObserver);
  };
  
  }  // namespace chromeos
  
  #endif  // CHROME_BROWSER_CHROMEOS_NET_NETWORK_THROTTLING_OBSERVER_H_
  