[Payment Request] Error message screen

ios/chrome/browser/payments/payment_request_error_coordinator.h

+// Copyright 2017 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.
+
+#ifndef IOS_CHROME_BROWSER_PAYMENTS_PAYMENT_REQUEST_ERROR_COORDINATOR_H_
+#define IOS_CHROME_BROWSER_PAYMENTS_PAYMENT_REQUEST_ERROR_COORDINATOR_H_
+
+#import <UIKit/UIKit.h>
+
+#include "base/ios/block_types.h"
+#import "ios/chrome/browser/chrome_coordinator.h"
+#import "ios/chrome/browser/payments/payment_request_error_view_controller.h"
+
+@class PaymentRequestErrorCoordinator;
+
+// Delegate protocol for PaymentRequestErrorCoordinator.
+@protocol PaymentRequestErrorCoordinatorDelegate<NSObject>
+
+// Notifies the delegate that the user has dismissed the error.
+- (void)paymentRequestErrorCoordinatorDidDismiss:
+    (PaymentRequestErrorCoordinator*)coordinator;
+
+@end
+
+// Coordinator responsible for creating and presenting the payment request error
+// view controller.
+@interface PaymentRequestErrorCoordinator
+    : ChromeCoordinator<PaymentRequestErrorViewControllerDelegate>
+
+// The callback to be called once the error is dismissed, if any.
+@property(nonatomic, copy) ProceduralBlock callback;
+
+// The delegate to be notified when the user dismisses the error.
+@property(nonatomic, weak) id<PaymentRequestErrorCoordinatorDelegate> delegate;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_PAYMENTS_PAYMENT_REQUEST_ERROR_COORDINATOR_H_