PaymentApp: Add interfaces for PaymentRequestEvent.

third_party/WebKit/Source/modules/payments/PaymentAppRequestData.idl

Index: third_party/WebKit/Source/modules/payments/PaymentAppRequestData.idl
diff --git a/third_party/WebKit/Source/modules/payments/PaymentAppRequestData.idl b/third_party/WebKit/Source/modules/payments/PaymentAppRequestData.idl
new file mode 100644
index 0000000000000000000000000000000000000000..fe6129ce61b8a99fbae6e91bbdc0a76a4e065ee3
--- /dev/null
+++ b/third_party/WebKit/Source/modules/payments/PaymentAppRequestData.idl
@@ -0,0 +1,13 @@
+// Copyright 2016 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.
+
+// https://w3c.github.io/webpayments-payment-apps-api/#idl-def-paymentapprequestdata
+
+dictionary PaymentAppRequestData {
+    DOMString origin;
+    sequence<PaymentMethodData> methodData;
+    PaymentItem total;
+    sequence<PaymentDetailsModifier> modifiers;
+    DOMString optionId;
+};