Record shutdown type UMA

chrome/browser/browser_shutdown.h

Index: chrome/browser/browser_shutdown.h
diff --git a/chrome/browser/browser_shutdown.h b/chrome/browser/browser_shutdown.h
index e3cf6506841d13a1bcdb9817be6c1a14c77dda57..84f4fe9bbb9fd760cf74ca49c12c5ffbb2db4a79 100644
--- a/chrome/browser/browser_shutdown.h
+++ b/chrome/browser/browser_shutdown.h
@@ -36,6 +36,8 @@ enum ShutdownType {
   END_SESSION
 };
 
+constexpr int kNumShutdownTypes = END_SESSION + 1;
+
 void RegisterPrefs(PrefRegistrySimple* registry);
 
 // Called when the browser starts shutting down so that we can measure shutdown
@@ -52,6 +54,9 @@ ShutdownType GetShutdownType();
 // Returns true if the session should be restarted.
 bool ShutdownPreThreadsStop();
 
+// Records the shutdown related prefs.
+void RecordShutdownInfoPrefs();
+
 // Performs the remaining shutdown tasks after all threads but the
 // main thread have been stopped.  This includes deleting g_browser_process.
 //