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

chrome/browser/lifetime/application_lifetime.h

Index: chrome/browser/lifetime/application_lifetime.h
diff --git a/chrome/browser/lifetime/application_lifetime.h b/chrome/browser/lifetime/application_lifetime.h
index 2d426ae8a94698cd3acf939ab2f1a6f93be81b18..cccbe176fdc7953d9b210f95780e3aa43a4796a7 100644
--- a/chrome/browser/lifetime/application_lifetime.h
+++ b/chrome/browser/lifetime/application_lifetime.h
@@ -76,7 +76,13 @@ 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.