Add policies to control power management on the Chrome OS login screen

chromeos/dbus/power_policy_controller.h

 // Copyright (c) 2013 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_DBUS_POWER_POLICY_CONTROLLER_H_
 #define CHROMEOS_DBUS_POWER_POLICY_CONTROLLER_H_
 
 #include <map>
 #include <string>
 
@@ skipping 56 matching lines @@
   // |*_screen_lock_delay_ms| are unset or set to higher values than what
   // this constant would imply.
   static const int kScreenLockAfterOffDelayMs;
 
   PowerPolicyController(DBusThreadManager* manager, PowerManagerClient* client);
   virtual ~PowerPolicyController();
 
   // Updates |prefs_policy_| with |values| and sends an updated policy.
   void ApplyPrefs(const PrefValues& values);
 
+  // Resets |prefs_policy_| to its defaults and sends an updated policy.
+  void ClearPrefs();
+
   // Registers a request to temporarily prevent the screen from getting
   // dimmed or turned off or the system from suspending in response to user
   // inactivity and sends an updated policy.  |reason| is a human-readable
   // description of the reason the lock was created.  Returns a unique ID
   // that can be passed to RemoveWakeLock() later.
   int AddScreenWakeLock(const std::string& reason);
   int AddSystemWakeLock(const std::string& reason);
 
   // Unregisters a request previously created via AddScreenWakeLock() or
   // AddSystemWakeLock() and sends an updated policy.
   void RemoveWakeLock(int id);
 
   // DBusThreadManagerObserver implementation:
   virtual void OnDBusThreadManagerDestroying(DBusThreadManager* manager)
       OVERRIDE;
 
   // PowerManagerClient::Observer implementation:
   virtual void PowerManagerRestarted() OVERRIDE;
 
  private:
+  friend class PowerPrefsTest;
+
   typedef std::map<int, std::string> WakeLockMap;
 
   // Sends a policy based on |prefs_policy_| to the power manager.
   void SendCurrentPolicy();
 
   // Sends an empty policy to the power manager to reset its configuration.
   void SendEmptyPolicy();
 
   DBusThreadManager* manager_;  // not owned
   PowerManagerClient* client_;  // not owned
@@ skipping 16 matching lines @@
 
   // Next ID to be used by AddScreenWakeLock() or AddSystemWakeLock().
   int next_wake_lock_id_;
 
   DISALLOW_COPY_AND_ASSIGN(PowerPolicyController);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_DBUS_POWER_POLICY_CONTROLLER_H_