[Payment Request] Error message screen

ios/chrome/browser/payments/payment_request_view_controller_actions.h

Index: ios/chrome/browser/payments/payment_request_view_controller_actions.h
diff --git a/ios/chrome/browser/payments/payment_request_view_controller_actions.h b/ios/chrome/browser/payments/payment_request_view_controller_actions.h
new file mode 100644
index 0000000000000000000000000000000000000000..6f7f0eaf104e88a0aab05409310e9b2d220a6dc9
--- /dev/null
+++ b/ios/chrome/browser/payments/payment_request_view_controller_actions.h
@@ -0,0 +1,19 @@
+// 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_VIEW_CONTROLLER_ACTIONS_H_
+#define IOS_CHROME_BROWSER_PAYMENTS_PAYMENT_REQUEST_VIEW_CONTROLLER_ACTIONS_H_
+
+// Protocol handling the actions sent in the PaymentRequestViewController.
+@protocol PaymentRequestViewControllerActions
+
+// Called when the user presses the cancel button.
+- (void)onCancel;
+
+// Called when the user presses the confirm button.
+- (void)onConfirm;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_PAYMENTS_PAYMENT_REQUEST_VIEW_CONTROLLER_ACTIONS_H_