chromeos: More power-related cleanup.

chrome/browser/chromeos/extensions/extension_system_event_observer.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_EXTENSIONS_EXTENSION_SYSTEM_EVENT_OBSERVER_H_
+#define CHROME_BROWSER_CHROMEOS_EXTENSIONS_EXTENSION_SYSTEM_EVENT_OBSERVER_H_
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "chromeos/dbus/power_manager_client.h"
+#include "chromeos/dbus/session_manager_client.h"
+
+namespace chromeos {
+
+// Dispatches extension events in response to system events.
+class ExtensionSystemEventObserver : public PowerManagerClient::Observer,
+                                     public SessionManagerClient::Observer {
+ public:
+  // This class registers/unregisters itself as an observer in ctor/dtor.
+  ExtensionSystemEventObserver();
+  virtual ~ExtensionSystemEventObserver();
+
+  // PowerManagerClient::Observer overrides:
+  virtual void BrightnessChanged(int level, bool user_initiated) OVERRIDE;
+  virtual void SystemResumed(const base::TimeDelta& sleep_duration) OVERRIDE;
+
+  // SessionManagerClient::Observer override.
+  virtual void ScreenIsUnlocked() OVERRIDE;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ExtensionSystemEventObserver);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_EXTENSIONS_EXTENSION_SYSTEM_EVENT_OBSERVER_H_