Implement 'invalid' AutocompleteErrorEvent#reason

components/autofill/content/renderer/autofill_agent.cc

Index: components/autofill/content/renderer/autofill_agent.cc
diff --git a/components/autofill/content/renderer/autofill_agent.cc b/components/autofill/content/renderer/autofill_agent.cc
index fbf59af641ce1de325a862eb7ca6cad466f62f23..b8a08b05dc95639495eb1bf47e66083b4c16115f 100644
--- a/components/autofill/content/renderer/autofill_agent.cc
+++ b/components/autofill/content/renderer/autofill_agent.cc
@@ -744,8 +744,11 @@ void AutofillAgent::OnRequestAutocompleteResult(
   if (in_flight_request_form_.isNull())
     return;
 
-  if (result == WebFormElement::AutocompleteResultSuccess)
+  if (result == WebFormElement::AutocompleteResultSuccess) {
     FillFormIncludingNonFocusableElements(form_data, in_flight_request_form_);
+    if (!in_flight_request_form_.checkValidityWithoutDispatchingEvents())
+      result = WebFormElement::AutocompleteResultErrorInvalid;
+  }
 
   in_flight_request_form_.finishRequestAutocomplete(result);
   in_flight_request_form_.reset();