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

components/autofill/core/browser/autofill_metrics.h

 // 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.
 
 #ifndef COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOFILL_METRICS_H_
 #define COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOFILL_METRICS_H_
 
 #include <stddef.h>
 #include <string>
 
@@ skipping 432 matching lines @@
   // and submission.
   static void LogFormFillDurationFromInteractionWithAutofill(
       const base::TimeDelta& duration);
 
   // This should be called when a fillable form that has not been Autofilled is
   // submitted.  |duration| should be the time elapsed between the initial form
   // interaction and submission.
   static void LogFormFillDurationFromInteractionWithoutAutofill(
       const base::TimeDelta& duration);
 
+  // This should be called each time a form is about to be submitted.
+  static void LogIsFormUserSubmitted(bool user_submitted);
+
   // This should be called each time a page containing forms is loaded.
   static void LogIsAutofillEnabledAtPageLoad(bool enabled);
 
   // This should be called each time a new profile is launched.
   static void LogIsAutofillEnabledAtStartup(bool enabled);
 
   // This should be called each time a new profile is launched.
   static void LogStoredProfileCount(size_t num_profiles);
 
   // Log the number of profiles available when an autofillable form is
@@ skipping 48 matching lines @@
     bool logged_suggestion_filled_was_masked_server_card_;
   };
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(AutofillMetrics);
 };
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOFILL_METRICS_H_