arc: Add a global 5 minute timeout for ARC opt-in

chrome/browser/chromeos/arc/arc_optin_uma.h

Index: chrome/browser/chromeos/arc/arc_optin_uma.h
diff --git a/chrome/browser/chromeos/arc/arc_optin_uma.h b/chrome/browser/chromeos/arc/arc_optin_uma.h
index 5955f6f6ad48f95aa5e95adc7b798714602febab..42f2a65eaddeb838230a24c761b547b90a8ff35e 100644
--- a/chrome/browser/chromeos/arc/arc_optin_uma.h
+++ b/chrome/browser/chromeos/arc/arc_optin_uma.h
@@ -75,6 +75,10 @@ enum class ProvisioningResult : int {
   // ARC instance is stopped during the sign in procedure.
   ARC_STOPPED = 16,
 
+  // ARC instance did not report sign in status within a reasonable amount of
+  // time.
+  OVERALL_SIGN_IN_TIMEOUT = 17,
+
   // The size of this enum; keep last.
   SIZE,
 };