[Payments] Support canMakePayment on Desktop

components/payments/content/payment_request.cc

 // Copyright 2016 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.
 
 #include "components/payments/content/payment_request.h"
 
 #include <utility>
 
 #include "base/memory/ptr_util.h"
 #include "components/payments/content/payment_details_validation.h"
@@ skipping 66 matching lines @@
     return;
 
   // TODO(mathp): Validate |result|.
 
   // When the renderer closes the connection,
   // PaymentRequest::OnConnectionTerminated will be called.
   client_->OnComplete();
 }
 
 void PaymentRequest::CanMakePayment() {
-  // TODO(mathp): Return whether we can make payment.
-  client_->OnCanMakePayment(mojom::CanMakePaymentQueryResult::CAN_MAKE_PAYMENT);
+  // TODO(crbug.com/704676): Implement a quota policy for this method.
+  client_->OnCanMakePayment(
+      state()->CanMakePayment()
+          ? mojom::CanMakePaymentQueryResult::CAN_MAKE_PAYMENT
+          : mojom::CanMakePaymentQueryResult::CANNOT_MAKE_PAYMENT);
 }
 
 void PaymentRequest::OnInvalidSpecProvided() {
   OnConnectionTerminated();
 }
 
 void PaymentRequest::OnPaymentResponseAvailable(
     mojom::PaymentResponsePtr response) {
   client_->OnPaymentResponse(std::move(response));
 }
@@ skipping 23 matching lines @@
   binding_.Close();
   delegate_->CloseDialog();
   manager_->DestroyRequest(this);
 }
 
 void PaymentRequest::Pay() {
   state_->GeneratePaymentResponse();
 }
 
 }  // namespace payments