[Autofill] Log the number of autofill profiles available at form submission

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 442 matching lines @@
 // static
 void AutofillMetrics::LogIsAutofillEnabledAtPageLoad(bool enabled) {
   UMA_HISTOGRAM_BOOLEAN("Autofill.IsEnabled.PageLoad", enabled);
 }
 
 // static
 void AutofillMetrics::LogStoredProfileCount(size_t num_profiles) {
   UMA_HISTOGRAM_COUNTS("Autofill.StoredProfileCount", num_profiles);
 }
 
+//static
+void AutofillMetrics::LogNumberOfProfilesAtFormSubmission(size_t num_profiles) {
+  UMA_HISTOGRAM_COUNTS("Autofill.StoredProfileCountAtSubmission", num_profiles);

[Ilya Sherman, 2015/01/28 23:17:57]

nit: I'd make the name a little bit more explicit, i.e. instead of
"AtSubmission" I'd write "AtAutofillableFormSubmission", or something like that.

+}
+
 // static
 void AutofillMetrics::LogAddressSuggestionsCount(size_t num_suggestions) {
   UMA_HISTOGRAM_COUNTS("Autofill.AddressSuggestionsCount", num_suggestions);
 }
 
 }  // namespace autofill