[Payments] Record use stats after payment request completion.

components/payments/core/payment_instrument.h

Index: components/payments/core/payment_instrument.h
diff --git a/components/payments/core/payment_instrument.h b/components/payments/core/payment_instrument.h
index 608235be4eaef5f8685fdbca2c8184d34e2557b5..76686631d9fd2ae0ee3ddf8565cb52a026c6f35c 100644
--- a/components/payments/core/payment_instrument.h
+++ b/components/payments/core/payment_instrument.h
@@ -45,6 +45,8 @@ class PaymentInstrument {
   // Returns whether the instrument is valid for the purposes of responding to
   // canMakePayment.
   virtual bool IsValidForCanMakePayment() = 0;
+  // Records the use of this payment instrument.
+  virtual void RecordUse() = 0;
 
   const std::string& method_name() const { return method_name_; }
   const base::string16& label() const { return label_; }