Adds UKM for autofill attributes in form_structure.

components/autofill/core/browser/form_structure.cc

Index: components/autofill/core/browser/form_structure.cc
diff --git a/components/autofill/core/browser/form_structure.cc b/components/autofill/core/browser/form_structure.cc
index 02e861fe9c2a9a7076100f8dc5cd20968a3c1d6b..00b651082f6985721a2a2d2b5b6f2c2595bc6cc6 100644
--- a/components/autofill/core/browser/form_structure.cc
+++ b/components/autofill/core/browser/form_structure.cc
@@ -36,6 +36,7 @@
 #include "components/autofill/core/common/signatures_util.h"
 #include "components/rappor/public/rappor_utils.h"
 #include "components/rappor/rappor_service_impl.h"
+#include "components/ukm/ukm_service.h"
 
 namespace autofill {
 namespace {
@@ -332,7 +333,7 @@ FormStructure::FormStructure(const FormData& form)
 
 FormStructure::~FormStructure() {}
 
-void FormStructure::DetermineHeuristicTypes() {
+void FormStructure::DetermineHeuristicTypes(ukm::UkmService* ukm_service) {
   const auto determine_heuristic_types_start_time = base::TimeTicks::Now();
 
   // First, try to detect field types based on each field's |autocomplete|
@@ -363,6 +364,13 @@ void FormStructure::DetermineHeuristicTypes() {
     if (has_author_specified_types_) {
       AutofillMetrics::LogDeveloperEngagementMetric(
           AutofillMetrics::FILLABLE_FORM_CONTAINS_TYPE_HINTS);
+      AutofillMetrics::LogDeveloperEngagementUkm(
+          ukm_service, source_url(),
+          {AutofillMetrics::FILLABLE_FORM_CONTAINS_TYPE_HINTS,
+           AutofillMetrics::FILLABLE_FORM_PARSED});
+    } else {
+      AutofillMetrics::LogDeveloperEngagementUkm(
+          ukm_service, source_url(), {AutofillMetrics::FILLABLE_FORM_PARSED});
     }
   }