Add histogram for "scan credit card" usage.

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 "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/sparse_histogram.h"
 #include "base/time/time.h"
@@ skipping 255 matching lines @@
 }
 
 // static
 void AutofillMetrics::LogCreditCardInfoBarMetric(InfoBarMetric metric) {
   DCHECK_LT(metric, NUM_INFO_BAR_METRICS);
   UMA_HISTOGRAM_ENUMERATION("Autofill.CreditCardInfoBar", metric,
                             NUM_INFO_BAR_METRICS);
 }
 
 // static
+void AutofillMetrics::LogScanCreditCardPromptMetric(
+    ScanCreditCardPromptMetric metric) {
+  DCHECK_LT(metric, NUM_SCAN_CREDIT_CARD_PROMPT_METRICS);
+  UMA_HISTOGRAM_ENUMERATION("Autofill.ScanCreditCardPrompt", metric,
+                            NUM_SCAN_CREDIT_CARD_PROMPT_METRICS);
+}
+
+// static
 void AutofillMetrics::LogDialogDismissalState(DialogDismissalState state) {
   UMA_HISTOGRAM_ENUMERATION("RequestAutocomplete.DismissalState",
                             state, NUM_DIALOG_DISMISSAL_STATES);
 }
 
 // static
 void AutofillMetrics::LogDialogInitialUserState(
     DialogInitialUserStateMetric user_type) {
   UMA_HISTOGRAM_ENUMERATION("RequestAutocomplete.InitialUserState",
                             user_type, NUM_DIALOG_INITIAL_USER_STATE_METRICS);
@@ skipping 160 matching lines @@
 
 void AutofillMetrics::LogStoredProfileCount(size_t num_profiles) const {
   UMA_HISTOGRAM_COUNTS("Autofill.StoredProfileCount", num_profiles);
 }
 
 void AutofillMetrics::LogAddressSuggestionsCount(size_t num_suggestions) const {
   UMA_HISTOGRAM_COUNTS("Autofill.AddressSuggestionsCount", num_suggestions);
 }
 
 }  // namespace autofill