PaymentApp: Add interfaces for PaymentRequestEvent.

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

Index: third_party/WebKit/Source/modules/payments/PaymentRequestEvent.idl
diff --git a/third_party/WebKit/Source/modules/payments/PaymentRequestEvent.idl b/third_party/WebKit/Source/modules/payments/PaymentRequestEvent.idl
new file mode 100644
index 0000000000000000000000000000000000000000..802545dbb8773135cf8fdac04e150da2b9d5743e
--- /dev/null
+++ b/third_party/WebKit/Source/modules/payments/PaymentRequestEvent.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-paymentrequestevent
+
+[
+    RuntimeEnabled=PaymentApp,
+    Exposed=ServiceWorker
+] interface PaymentRequestEvent : ExtendableEvent {
+    readonly attribute PaymentAppRequestData data;
+    void respondWith(Promise<PaymentResponse> response);

[please use gerrit instead, 2016/11/21 20:31:36]

The spec says:

void respondWith((Promise<PaymentResponse> or PaymentResponse) r);

[zino, 2016/11/21 23:22:13]

IMHO, the spec should be respondWith(Promise<PaymentResponse> response);
We can refer to existing example (in service worker):
https://github.com/w3c/ServiceWorker/issues/724
Another example is updateWith in PaymentRequestUpdateEvent.idl.

So, I sent a pull request to fix this to the spec repo.
 - https://github.com/w3c/webpayments-payment-apps-api/pull/71

+};