cros: Add enterprise user session metrics

chrome/browser/chromeos/login/signin_specifics.h

Index: chrome/browser/chromeos/login/signin_specifics.h
diff --git a/chrome/browser/chromeos/login/signin_specifics.h b/chrome/browser/chromeos/login/signin_specifics.h
index da1014f5abfd41e80be4b1442c577e2f9d36a1ed..e7ecf81694e8f9e177035e853595344ab9cb29d0 100644
--- a/chrome/browser/chromeos/login/signin_specifics.h
+++ b/chrome/browser/chromeos/login/signin_specifics.h
@@ -19,10 +19,13 @@ struct SigninSpecifics {
   std::string guest_mode_url;
 
   // Specifies if locale should be passed to guest mode url.
-  bool guest_mode_url_append_locale;
+  bool guest_mode_url_append_locale = false;
 
   // Controls diagnostic mode for Kiosk App signin.
-  bool kiosk_diagnostic_mode;
+  bool kiosk_diagnostic_mode = false;
+
+  // Whether it is an automatic login.
+  bool is_auto_login = false;
 };
 
 }  // namespace chromeos