[Payments] Improve the closing of the PR dialog.

components/payments/payment_request_dialog.h

Index: components/payments/payment_request_dialog.h
diff --git a/components/payments/payment_request_dialog.h b/components/payments/payment_request_dialog.h
new file mode 100644
index 0000000000000000000000000000000000000000..3141b1dd3d45207030e657df428ee541b34e14eb
--- /dev/null
+++ b/components/payments/payment_request_dialog.h
@@ -0,0 +1,22 @@
+// 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 COMPONENTS_PAYMENTS_PAYMENT_REQUEST_DIALOG_H_
+#define COMPONENTS_PAYMENTS_PAYMENT_REQUEST_DIALOG_H_
+
+namespace payments {
+
+// Used to interact with a cross-platform Payment Request dialog.
+class PaymentRequestDialog {
+ public:
+  virtual ~PaymentRequestDialog() {}
+
+  virtual void ShowDialog() = 0;
+
+  virtual void CloseDialog() = 0;
+};
+
+}  // namespace payments
+
+#endif  // COMPONENTS_PAYMENTS_PAYMENT_REQUEST_DIALOG_H_