[Autofill] Add FormEvent logging for "will submit form".

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 438 matching lines @@
     const base::TimeDelta& duration) {
   UMA_HISTOGRAM_CUSTOM_TIMES(
        "Autofill.FillDuration.FromInteraction.WithoutAutofill",
        duration,
        base::TimeDelta::FromMilliseconds(100),
        base::TimeDelta::FromMinutes(10),
        50);
 }
 
 // static
+void AutofillMetrics::LogIsFormUserSubmitted(bool user_submitted) {
+  UMA_HISTOGRAM_BOOLEAN("Autofill.IsFormUserSubmitted", user_submitted);
+}
+
+// static
 void AutofillMetrics::LogIsAutofillEnabledAtStartup(bool enabled) {
   UMA_HISTOGRAM_BOOLEAN("Autofill.IsEnabled.Startup", enabled);
 }
 
 // static
 void AutofillMetrics::LogIsAutofillEnabledAtPageLoad(bool enabled) {
   UMA_HISTOGRAM_BOOLEAN("Autofill.IsEnabled.PageLoad", enabled);
 }
 
 // static
@@ skipping 135 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