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..2675e849709338b82fb7bd085da82a81dffb731c 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 ApplicationLifetime { kForceReboot, kOptionalReboot };

[James Cook, 2016/12/03 00:18:20]

nit: I wouldn't call the class itself ApplicationLifetime. It's more like a
RebootPolicy or something. Nico might have been thinking this code was in a
class ApplicationLifetime based on the filename.

[Nico, 2016/12/03 00:23:13]

Yes, I thought this was in a class and used a plain non-class enum. Using an
enum class is fine if you prefer though; James's suggestion sounds good to me.

[Greg K, 2016/12/06 00:13:15]

Done.

 void NotifyAndTerminate(bool fast_path);
+void NotifyAndTerminate(bool fast_path, ApplicationLifetime lifetime);
 
 #if !defined(OS_ANDROID)
 // Called once the application is exiting.