Display "Restart to update" dialog to Chrome OS users.

chrome/browser/lifetime/application_lifetime.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_LIFETIME_APPLICATION_LIFETIME_H_
 #define CHROME_BROWSER_LIFETIME_APPLICATION_LIFETIME_H_
 
 #include "base/compiler_specific.h"
 #include "build/build_config.h"
 
@@ skipping 58 matching lines @@
 void SessionEnding();
 
 #endif  // !defined(OS_ANDROID)
 
 // Emits APP_TERMINATING notification. It is guaranteed that the
 // notification is sent only once.
 void NotifyAppTerminating();
 
 // Send out notifications.
 // For ChromeOS, also request session manager to end the session.
+// |lifetime| is used to signal whether or not a reboot should be forced. By
+// default, the functions only reboot the system if an update is available. When
+// a component flash update is present, but not a system update, the
+// kForceReboot flag is passed.
+enum class RebootPolicy { kForceReboot, kOptionalReboot };
 void NotifyAndTerminate(bool fast_path);
+void NotifyAndTerminate(bool fast_path, RebootPolicy reboot_policy);
 
 #if !defined(OS_ANDROID)
 // Called once the application is exiting.
 void OnAppExiting();
 
 // Called once the application is exiting to do any platform specific
 // processing required.
 void HandleAppExitingForPlatform();
 #endif  // !defined(OS_ANDROID)
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_LIFETIME_APPLICATION_LIFETIME_H_