Logs all reasons card upload was not offered in UKM and UMA.

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 360 matching lines @@
     for (const auto& field : fields_) {
       const auto iter = field_type_map.find(field->unique_name());
       if (iter != field_type_map.end())
         field->set_heuristic_type(iter->second.BestHeuristicType());
     }
   }
 
   UpdateAutofillCount();
   IdentifySections(has_author_specified_sections_);
 
-  std::vector<AutofillMetrics::DeveloperEngagementMetric> metrics;
+  int developer_engagement_metrics = 0;
   if (IsAutofillable()) {
     AutofillMetrics::DeveloperEngagementMetric metric =
         has_author_specified_types_
             ? AutofillMetrics::FILLABLE_FORM_PARSED_WITH_TYPE_HINTS
             : AutofillMetrics::FILLABLE_FORM_PARSED_WITHOUT_TYPE_HINTS;
-    metrics.push_back(metric);
+    developer_engagement_metrics |= 1 << metric;
     AutofillMetrics::LogDeveloperEngagementMetric(metric);
   }
 
   if (has_author_specified_upi_vpa_hint_) {
     AutofillMetrics::LogDeveloperEngagementMetric(
         AutofillMetrics::FORM_CONTAINS_UPI_VPA_HINT);
-    metrics.push_back(AutofillMetrics::FORM_CONTAINS_UPI_VPA_HINT);
+    developer_engagement_metrics |=
+        1 << AutofillMetrics::FORM_CONTAINS_UPI_VPA_HINT;
   }
 
-  AutofillMetrics::LogDeveloperEngagementUkm(ukm_service, source_url(),
-                                             metrics);
+  if (developer_engagement_metrics)
+    AutofillMetrics::LogDeveloperEngagementUkm(ukm_service, source_url(),
+                                               developer_engagement_metrics);
 
   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,
     bool observed_submission,
@@ skipping 972 matching lines @@
               filtered_strings[0].at(prefix_len)) {
         // Mismatch found.
         return filtered_strings[i].substr(0, prefix_len);
       }
     }
   }
   return filtered_strings[0];
 }
 
 }  // namespace autofill