[Payment Request] Records the use of data models used in Payment Request.

ios/chrome/browser/payments/payment_request.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 IOS_CHROME_BROWSER_PAYMENTS_PAYMENT_REQUEST_H_
 #define IOS_CHROME_BROWSER_PAYMENTS_PAYMENT_REQUEST_H_
 
 #include <map>
 #include <memory>
 #include <set>
@@ skipping 186 matching lines @@
   // is one. Returns nullptr otherwise.
   web::PaymentShippingOption* selected_shipping_option() const {
     return selected_shipping_option_;
   }
 
   virtual payments::PaymentsProfileComparator* profile_comparator();
 
   // Returns whether the current PaymentRequest can be used to make a payment.
   bool CanMakePayment() const;
 
+  // Record the use of the data models that were used in the Payment Request.
+  void RecordUseStats();
+
  protected:
   // Fetches the autofill profiles for this user from the PersonalDataManager,
   // and stores copies of them, owned by this PaymentRequest, in profile_cache_.
   void PopulateProfileCache();
 
   // Sets the available shipping and contact profiles as references to the
   // cached profiles ordered by completeness.
   void PopulateAvailableProfiles();
 
   // Fetches the autofill credit cards for this user from the
@@ skipping 71 matching lines @@
   // A vector of pointers to the shipping options in |web_payment_request_|.
   std::vector<web::PaymentShippingOption*> shipping_options_;
   web::PaymentShippingOption* selected_shipping_option_;
 
   payments::PaymentsProfileComparator profile_comparator_;
 
   DISALLOW_COPY_AND_ASSIGN(PaymentRequest);
 };
 
 #endif  // IOS_CHROME_BROWSER_PAYMENTS_PAYMENT_REQUEST_H_