Add chrome.power extension API.

chrome/browser/chromeos/extensions/power/power_api_manager.h

-// Copyright (c) 2012 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_EXTENSIONS_POWER_POWER_API_MANAGER_H_
-#define CHROME_BROWSER_CHROMEOS_EXTENSIONS_POWER_POWER_API_MANAGER_H_
-
-#include <set>
-#include <string>
-
-#include "base/memory/singleton.h"
-#include "content/public/browser/notification_observer.h"
-#include "content/public/browser/notification_registrar.h"
-
-namespace chromeos {
-class PowerStateOverride;
-}
-
-namespace extensions {
-namespace power {
-
-class PowerApiManager : public content::NotificationObserver {
- public:
-  static PowerApiManager* GetInstance();
-
-  // Add an extension lock for an extension. Calling this for an
-  // extension id already with a lock will do nothing.
-  void AddExtensionLock(const std::string& extension_id);
-
-  // Remove an extension lock for an extension. Calling this for an
-  // extension id without a lock will do nothing.
-  void RemoveExtensionLock(const std::string& extension_id);
-
-  // Overridden from content::NotificationObserver.
-  virtual void Observe(int type,
-                       const content::NotificationSource& source,
-                       const content::NotificationDetails& details) OVERRIDE;
-
- private:
-  friend struct DefaultSingletonTraits<PowerApiManager>;
-
-  // Singleton class - use GetInstance instead.
-  PowerApiManager();
-  virtual ~PowerApiManager();
-
-  // Check the state of the set of extension IDs with a lock.
-  // If we have any extensions with a lock, make sure that power management
-  // is overriden. If no extensions have a lock, ensure that our power
-  // management override is released.
-  void UpdatePowerSettings();
-
-  content::NotificationRegistrar registrar_;
-
-  scoped_refptr<chromeos::PowerStateOverride> power_state_override_;
-
-  // Set of extension IDs that have a keep awake lock.
-  std::set<std::string> extension_ids_set_;
-
-  DISALLOW_COPY_AND_ASSIGN(PowerApiManager);
-};
-
-}  // namespace power
-}  // namespace extensions
-
-#endif  // CHROME_BROWSER_CHROMEOS_EXTENSIONS_POWER_POWER_API_MANAGER_H_