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

ios/chrome/browser/payments/payment_request.h

Index: ios/chrome/browser/payments/payment_request.h
diff --git a/ios/chrome/browser/payments/payment_request.h b/ios/chrome/browser/payments/payment_request.h
index 31cb1d7657a196671e9d70132cdd5ec609dc47e2..52a58db60103e4392a98dcc5c09efaf2544f7e96 100644
--- a/ios/chrome/browser/payments/payment_request.h
+++ b/ios/chrome/browser/payments/payment_request.h
@@ -204,6 +204,9 @@ class PaymentRequest : public payments::PaymentOptionsProvider,
   // 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_.