[Payment Request] Error message screen

ios/chrome/browser/payments/payment_request_coordinator.h

Index: ios/chrome/browser/payments/payment_request_coordinator.h
diff --git a/ios/chrome/browser/payments/payment_request_coordinator.h b/ios/chrome/browser/payments/payment_request_coordinator.h
index b2e1d9a0dcb7958b772b769db1ee2d1ef5518db0..ff99043eb148f5758c1e66e44a0a91a76f1ee77f 100644
--- a/ios/chrome/browser/payments/payment_request_coordinator.h
+++ b/ios/chrome/browser/payments/payment_request_coordinator.h
@@ -12,6 +12,7 @@
 #import "ios/chrome/browser/payments/payment_items_display_coordinator.h"
 #import "ios/chrome/browser/payments/payment_method_selection_coordinator.h"
 #include "ios/chrome/browser/payments/payment_request.h"
+#include "ios/chrome/browser/payments/payment_request_error_coordinator.h"
 #import "ios/chrome/browser/payments/payment_request_view_controller.h"
 #import "ios/chrome/browser/payments/shipping_address_selection_coordinator.h"
 #import "ios/chrome/browser/payments/shipping_option_selection_coordinator.h"
@@ -48,6 +49,7 @@ class ChromeBrowserState;
 // provided in the initializer.
 @interface PaymentRequestCoordinator
     : ChromeCoordinator<PaymentRequestViewControllerDelegate,
+                        PaymentRequestErrorCoordinatorDelegate,
                         PaymentItemsDisplayCoordinatorDelegate,
                         PaymentMethodSelectionCoordinatorDelegate,
                         ShippingAddressSelectionCoordinatorDelegate,
@@ -89,6 +91,9 @@ class ChromeBrowserState;
 // Updates the payment details of the PaymentRequest and updates the UI.
 - (void)updatePaymentDetails:(web::PaymentDetails)paymentDetails;
 
+// Displays an error message. Invokes |callback| when the message is dismissed.
+- (void)displayErrorWithCallback:(void (^)())callback;
+
 // Called when a credit card has been successfully unmasked.
 - (void)fullCardRequestDidSucceedWithCard:(const autofill::CreditCard&)card
                                       CVC:(const base::string16&)cvc;