[Autofill] Debounce suggestions poll user actions for the same field.

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 613 matching lines @@
       logged_suggestion_filled_was_masked_server_card_(false) {
 }
 
 void AutofillMetrics::FormEventLogger::OnDidInteractWithAutofillableForm() {
   if (!has_logged_interacted_) {
     has_logged_interacted_ = true;
     Log(AutofillMetrics::FORM_EVENT_INTERACTED_ONCE);
   }
 }
 
-void AutofillMetrics::FormEventLogger::OnDidPollSuggestions() {
-  if (is_for_credit_card_) {
-    base::RecordAction(
-        base::UserMetricsAction("Autofill_PolledCreditCardSuggestions"));
-  } else {
-    base::RecordAction(
-        base::UserMetricsAction("Autofill_PolledProfileSuggestions"));
+void AutofillMetrics::FormEventLogger::OnDidPollSuggestions(
+    const FormFieldData& field) {
+  // Record only one poll user action for consecutive polls of the same field.
+  // This is to avoid recording too many poll actions (for example when a user
+  // types in a field, triggering multiple queries) to make the analysis more
+  // simple.
+  if (!field.SameFieldAs(last_polled_field_)) {
+    if (is_for_credit_card_) {
+      base::RecordAction(
+          base::UserMetricsAction("Autofill_PolledCreditCardSuggestions"));
+    } else {
+      base::RecordAction(
+          base::UserMetricsAction("Autofill_PolledProfileSuggestions"));
+    }
+
+    last_polled_field_ = field;
   }
 }
 
 void AutofillMetrics::FormEventLogger::OnDidShowSuggestions() {
   Log(AutofillMetrics::FORM_EVENT_SUGGESTIONS_SHOWN);
   if (!has_logged_suggestions_shown_) {
     has_logged_suggestions_shown_ = true;
     Log(AutofillMetrics::FORM_EVENT_SUGGESTIONS_SHOWN_ONCE);
   }
 
@@ skipping 133 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