app_mode: Add runtime.onRestartRequired event.

chrome/browser/chromeos/system/automatic_reboot_manager_observer.h

+// Copyright 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_SYSTEM_AUTOMATIC_REBOOT_MANAGER_OBSERVER_H_
+#define CHROME_BROWSER_CHROMEOS_SYSTEM_AUTOMATIC_REBOOT_MANAGER_OBSERVER_H_
+
+namespace chromeos {
+namespace system {
+
+class AutomaticRebootManagerObserver {
+ public:
+  enum Reason {
+    REBOOT_REASON_UNKNOWN,
+    REBOOT_REASON_OS_UPDATE,
+    REBOOT_REASON_PERIODIC,
+  };
+
+  // Invoked when a reboot is scheduled.
+  virtual void OnRebootScheduled(Reason reason) = 0;
+
+  // Invoked before the automatic reboot manager shuts down.
+  virtual void willShutdownAutomaticRebootManager() = 0;

[bartfab (slow), 2013/06/21 06:27:58]

Capitalization nit: s/will/Will/

[xiyuan, 2013/06/21 16:50:56]

Done.

+
+ protected:
+  virtual ~AutomaticRebootManagerObserver() {}
+};
+
+}  // namespace system
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_SYSTEM_AUTOMATIC_REBOOT_MANAGER_OBSERVER_H_