Add UKM logging of UPI-VPA autocomplete hints.

components/autofill/core/browser/form_structure.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/autofill/core/browser/form_structure.h"
 
 #include <stdint.h>
 
 #include <algorithm>
 #include <map>
@@ skipping 357 matching lines @@
             ? AutofillMetrics::FILLABLE_FORM_PARSED_WITH_TYPE_HINTS
             : AutofillMetrics::FILLABLE_FORM_PARSED_WITHOUT_TYPE_HINTS;
     AutofillMetrics::LogDeveloperEngagementMetric(metric);
     AutofillMetrics::LogDeveloperEngagementUkm(ukm_service, source_url(),
                                                metric);
   }
 
   if (has_author_specified_upi_vpa_hint_) {
     AutofillMetrics::LogDeveloperEngagementMetric(
         AutofillMetrics::FORM_CONTAINS_UPI_VPA_HINT);
+    AutofillMetrics::LogDeveloperEngagementUkm(
+        ukm_service, source_url(), AutofillMetrics::FORM_CONTAINS_UPI_VPA_HINT);
   }
 
   AutofillMetrics::LogDetermineHeuristicTypesTiming(
       base::TimeTicks::Now() - determine_heuristic_types_start_time);
 }
 
 bool FormStructure::EncodeUploadRequest(
     const ServerFieldTypeSet& available_field_types,
     bool form_was_autofilled,
     const std::string& login_form_signature,
@@ skipping 948 matching lines @@
               filtered_strings[0].at(prefix_len)) {
         // Mismatch found.
         return filtered_strings[i].substr(0, prefix_len);
       }
     }
   }
   return filtered_strings[0];
 }
 
 }  // namespace autofill