[Payments] Desktop: Error message in the dialog.

chrome/browser/ui/views/payments/error_message_view_controller.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 CHROME_BROWSER_UI_VIEWS_PAYMENTS_ERROR_MESSAGE_VIEW_CONTROLLER_H_
+#define CHROME_BROWSER_UI_VIEWS_PAYMENTS_ERROR_MESSAGE_VIEW_CONTROLLER_H_
+
+#include <memory>
+
+#include "base/macros.h"
+#include "chrome/browser/ui/views/payments/payment_request_sheet_controller.h"
+
+namespace views {
+class View;
+}
+
+namespace payments {
+
+class PaymentRequestSpec;
+class PaymentRequestState;
+class PaymentRequestDialogView;
+
+// The PaymentRequestSheetController subtype for the Error Message screen of the
+// Payment Request flow.
+class ErrorMessageViewController : public PaymentRequestSheetController {
+ public:
+  // Does not take ownership of the arguments, which should outlive this object.
+  ErrorMessageViewController(PaymentRequestSpec* spec,
+                             PaymentRequestState* state,
+                             PaymentRequestDialogView* dialog);
+  ~ErrorMessageViewController() override;
+
+ private:
+  // PaymentRequestSheetController:
+  base::string16 GetSecondaryButtonLabel() override;
+  bool ShouldShowHeaderBackArrow() override;
+  base::string16 GetSheetTitle() override;
+  void FillContentView(views::View* content_view) override;
+
+  DISALLOW_COPY_AND_ASSIGN(ErrorMessageViewController);
+};
+
+}  // namespace payments
+
+#endif  // CHROME_BROWSER_UI_VIEWS_PAYMENTS_ERROR_MESSAGE_VIEW_CONTROLLER_H_