[Autofill] Add user actions for checkout flow.

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 675 matching lines @@
     inline void set_is_server_data_available(bool is_server_data_available) {
       is_server_data_available_ = is_server_data_available;
     }
 
     inline void set_is_local_data_available(bool is_local_data_available) {
       is_local_data_available_ = is_local_data_available;
     }
 
     void OnDidInteractWithAutofillableForm();
 
+    void OnDidPollSuggestions();
+
     void OnDidShowSuggestions();
 
     void OnDidSelectMaskedServerCardSuggestion();
 
     // In case of masked cards, caller must make sure this gets called before
     // the card is upgraded to a full card.
     void OnDidFillSuggestion(const CreditCard& credit_card);
 
     void OnDidFillSuggestion(const AutofillProfile& profile);
 
@@ skipping 17 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_