[Payments] Desktop: Error message in the dialog.

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 56 matching lines @@
 }
 
 void PaymentRequest::Abort() {
   // The API user has decided to abort. We return a successful abort message to
   // the renderer, which closes the Mojo message pipe, which triggers
   // PaymentRequest::OnConnectionTerminated, which destroys this object.
   if (client_.is_bound())
     client_->OnAbort(true /* aborted_successfully */);
 }
 
-void PaymentRequest::Complete(payments::mojom::PaymentComplete result) {
+void PaymentRequest::Complete(mojom::PaymentComplete result) {
   if (!client_.is_bound())
     return;
 
-  // TODO(mathp): Validate |result|.
-
-  // When the renderer closes the connection,
-  // PaymentRequest::OnConnectionTerminated will be called.
-  client_->OnComplete();
+  if (result != mojom::PaymentComplete::SUCCESS) {
+    delegate_->ShowErrorMessage();
+  } else {
+    // When the renderer closes the connection,
+    // PaymentRequest::OnConnectionTerminated will be called.
+    client_->OnComplete();
+  }
 }
 
 void PaymentRequest::CanMakePayment() {
   // TODO(crbug.com/704676): Implement a quota policy for this method.
   // PaymentRequest.canMakePayments() never returns false in incognito mode.
   client_->OnCanMakePayment(
       delegate_->IsIncognito() || state()->CanMakePayment()
           ? mojom::CanMakePaymentQueryResult::CAN_MAKE_PAYMENT
           : mojom::CanMakePaymentQueryResult::CANNOT_MAKE_PAYMENT);
   if (observer_for_testing_)
@@ skipping 34 matching lines @@
   binding_.Close();
   delegate_->CloseDialog();
   manager_->DestroyRequest(this);
 }
 
 void PaymentRequest::Pay() {
   state_->GeneratePaymentResponse();
 }
 
 }  // namespace payments