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

chrome/browser/chromeos/power/power_prefs.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 CHROME_BROWSER_CHROMEOS_POWER_POWER_PREFS_H_
+#define CHROME_BROWSER_CHROMEOS_POWER_POWER_PREFS_H_
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
+
+class PrefChangeRegistrar;
+class Profile;
+
+namespace user_prefs {
+class PrefRegistrySyncable;
+}
+
+namespace chromeos {
+
+class PowerPolicyController;
+
+// Sends an updated power policy to the |power_policy_controller| whenever one
+// of the power-related prefs changes.
+class PowerPrefs : public content::NotificationObserver {
+ public:
+  explicit PowerPrefs(PowerPolicyController* power_policy_controller);
+  virtual ~PowerPrefs();
+
+  // Register power prefs with default values applicable to a user profile.
+  static void RegisterUserProfilePrefs(
+      user_prefs::PrefRegistrySyncable* registry);
+
+  // Register power prefs with default values applicable to the login profile.
+  static void RegisterLoginProfilePrefs(
+      user_prefs::PrefRegistrySyncable* registry);
+
+  // content::NotificationObserver:
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+
+  void UpdatePowerPolicyFromPrefs();
+
+ private:
+  friend class PowerPrefsTest;
+
+  // Register power prefs whose default values are the same in user profiles and
+  // the login profile.
+  static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
+
+  void SetProfile(Profile* profile);
+
+  PowerPolicyController* power_policy_controller_;  // Not owned.
+
+  content::NotificationRegistrar notification_registrar_;
+
+  Profile* profile_;  // Not owned.
+  scoped_ptr<PrefChangeRegistrar> pref_change_registrar_;
+
+  DISALLOW_COPY_AND_ASSIGN(PowerPrefs);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_POWER_POWER_PREFS_H_