Credential Manager API pops up an auto-signin toast.

components/password_manager/core/browser/password_manager_metrics_util.h

Index: components/password_manager/core/browser/password_manager_metrics_util.h
diff --git a/components/password_manager/core/browser/password_manager_metrics_util.h b/components/password_manager/core/browser/password_manager_metrics_util.h
index d4ea6c33237ac76ff68b8d3f57b8c2bc52bd4ee6..eb771b00ba7c768ccf0fb13f84d8438143b93d54 100644
--- a/components/password_manager/core/browser/password_manager_metrics_util.h
+++ b/components/password_manager/core/browser/password_manager_metrics_util.h
@@ -30,6 +30,7 @@ enum UIDisplayDisposition {
   MANUAL_BLACKLISTED,
   AUTOMATIC_GENERATED_PASSWORD_CONFIRMATION,
   AUTOMATIC_CREDENTIAL_REQUEST,
+  AUTOMATIC_SIGNIN_TOAST,
   NUM_DISPLAY_DISPOSITIONS
 };
 
@@ -48,6 +49,7 @@ enum UIDismissalReason {
   CLICKED_CREDENTIAL,
   CLICKED_COLLECT_URL,
   CLICKED_DO_NOT_COLLECT_URL,
+  AUTO_SIGNIN_TOAST_TIMEOUT,
   NUM_UI_RESPONSES,
 
   // If we add the omnibox icon _without_ intending to display the bubble,