Log observations of explicit UPI-VPA autocomplete hints.

components/autofill/core/browser/autofill_metrics.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/autofill_metrics.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "base/metrics/histogram_macros.h"
@@ skipping 679 matching lines @@
                             NUM_CONVERTED_ADDRESS_CONVERSION_TYPES);
 }
 
 // static
 void AutofillMetrics::LogShowedHttpNotSecureExplanation() {
   base::RecordAction(
       base::UserMetricsAction("Autofill_ShowedHttpNotSecureExplanation"));
 }
 
 // static
+void AutofillMetrics::LogExplicitUpiVpaHint() {
+  UMA_HISTOGRAM_BOOLEAN("Autofill.ExplicitUpiVpaHint", true);

[Mathieu, 2017/03/23 11:26:22]

We could use something like Autofill.DeveloperEngagement.UpiVpaHint so that
anyone looking up the *other* autocomplete attribute metric
"Autofill.DeveloperEngagement" will see this one as well, close by

[Roger McFarlane (Chromium), 2017/03/28 19:08:23]

Added as an Autofill.DeveloperEngagement histogram enum.

+}
+
+// static
 void AutofillMetrics::LogCardUploadDecisionUkm(
     ukm::UkmService* ukm_service,
     const GURL& url,
     AutofillMetrics::CardUploadDecisionMetric upload_decision) {
   if (upload_decision >= AutofillMetrics::NUM_CARD_UPLOAD_DECISION_METRICS)
     return;
 
   // Set up as a map because the follow-up CL will add more metrics.
   std::map<std::string, int> metrics = {
       {internal::kUKMCardUploadDecisionMetricName,
@@ skipping 220 matching lines @@
   else if (is_server_data_available_ && !is_local_data_available_)
     name += ".WithOnlyServerData";
   else if (!is_server_data_available_ && is_local_data_available_)
     name += ".WithOnlyLocalData";
   else
     name += ".WithBothServerAndLocalData";
   LogUMAHistogramEnumeration(name, event, NUM_FORM_EVENTS);
 }
 
 }  // namespace autofill