chromeos: Implement power button animations for Aura.

chrome/browser/chromeos/power/power_button_observer.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_POWER_POWER_BUTTON_OBSERVER_H_
+#define CHROME_BROWSER_CHROMEOS_POWER_POWER_BUTTON_OBSERVER_H_
+#pragma once
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "chrome/browser/chromeos/dbus/power_manager_client.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
+
+namespace chromeos {
+
+// Listens for power button, login, and screen lock events and passes them to
+// the Aura shell's PowerButtonController class.
+class PowerButtonObserver : public content::NotificationObserver,
+                            public PowerManagerClient::Observer {
+ public:
+  PowerButtonObserver();
+  virtual ~PowerButtonObserver();
+
+ private:
+  // content::NotificationObserver implementation:
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+
+  // PowerManagerClient::Observer implementation.
+  virtual void PowerButtonStateChanged(
+      bool down, const base::TimeTicks& timestamp) OVERRIDE;
+  virtual void LockButtonStateChanged(
+      bool down, const base::TimeTicks& timestamp) OVERRIDE;
+  virtual void LockScreen() OVERRIDE;
+
+  content::NotificationRegistrar registrar_;
+
+  DISALLOW_COPY_AND_ASSIGN(PowerButtonObserver);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_POWER_POWER_BUTTON_OBSERVER_H_