[Payments] Record use stats after payment request completion.

components/payments/content/payment_request_state.h

 // Copyright 2017 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_PAYMENTS_CONTENT_PAYMENT_REQUEST_STATE_H_
 #define COMPONENTS_PAYMENTS_CONTENT_PAYMENT_REQUEST_STATE_H_
 
 #include <memory>
 #include <string>
 #include <vector>
@@ skipping 84 matching lines @@
   // false for "https://bobpay.com".
   bool AreRequestedMethodsSupported() const;
 
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
 
   // Initiates the generation of the PaymentResponse. Callers should check
   // |is_ready_to_pay|, which is inexpensive.
   void GeneratePaymentResponse();
 
+  // Record the use of the data models that were used in the Payment Request.
+  void RecordUseStats();
+
   // Gets the Autofill Profile representing the shipping address or contact
   // information currently selected for this PaymentRequest flow. Can return
   // null.
   autofill::AutofillProfile* selected_shipping_profile() const {
     return selected_shipping_profile_;
   }
   autofill::AutofillProfile* selected_contact_profile() const {
     return selected_contact_profile_;
   }
   // Returns the currently selected instrument for this PaymentRequest flow.
@@ skipping 104 matching lines @@
   PaymentsProfileComparator profile_comparator_;
 
   base::ObserverList<Observer> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(PaymentRequestState);
 };
 
 }  // namespace payments
 
 #endif  // COMPONENTS_PAYMENTS_CONTENT_PAYMENT_REQUEST_STATE_H_