[Payments] Record CanMakePayment metrics on Desktop.

components/payments/core/test_payment_request_delegate.h

Index: components/payments/core/test_payment_request_delegate.h
diff --git a/components/payments/core/test_payment_request_delegate.h b/components/payments/core/test_payment_request_delegate.h
index a38a6067051a354a3051430c67a22135d336c699..92b0a00fe5accc71352018f6057bc1e1a4f79de0 100644
--- a/components/payments/core/test_payment_request_delegate.h
+++ b/components/payments/core/test_payment_request_delegate.h
@@ -31,8 +31,11 @@ class TestPaymentRequestDelegate : public PaymentRequestDelegate {
           result_delegate) override;
   AddressNormalizer* GetAddressNormalizer() override;
   autofill::RegionDataLoader* GetRegionDataLoader() override;
+  ukm::UkmService* GetUkmService() override;
 
   TestAddressNormalizer* GetTestAddressNormalizer();
+  void DelayFullCardRequestCompletion();
+  void CompleteFullCardRequest();
 
  private:
   autofill::PersonalDataManager* personal_data_manager_;
@@ -43,6 +46,8 @@ class TestPaymentRequestDelegate : public PaymentRequestDelegate {
   autofill::CreditCard full_card_request_card_;
   base::WeakPtr<autofill::payments::FullCardRequest::ResultDelegate>
       full_card_result_delegate_;
+
+  bool instantaneous_full_card_request_result_ = true;
   DISALLOW_COPY_AND_ASSIGN(TestPaymentRequestDelegate);
 };