PaymentApp: Add interfaces for PaymentRequestEvent.

third_party/WebKit/Source/modules/payments/PaymentAppServiceWorkerGlobalScope.h

Index: third_party/WebKit/Source/modules/payments/PaymentAppServiceWorkerGlobalScope.h
diff --git a/third_party/WebKit/Source/modules/payments/PaymentAppServiceWorkerGlobalScope.h b/third_party/WebKit/Source/modules/payments/PaymentAppServiceWorkerGlobalScope.h
new file mode 100644
index 0000000000000000000000000000000000000000..7f7c1d7db9b9f06b31b7ff016d93571fc8f55c18
--- /dev/null
+++ b/third_party/WebKit/Source/modules/payments/PaymentAppServiceWorkerGlobalScope.h
@@ -0,0 +1,21 @@
+// 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.
+
+#ifndef PaymentAppServiceWorkerGlobalScope_h
+#define PaymentAppServiceWorkerGlobalScope_h
+
+#include "core/events/EventTarget.h"
+
+namespace blink {
+
+class PaymentAppServiceWorkerGlobalScope {
+  STATIC_ONLY(PaymentAppServiceWorkerGlobalScope);
+
+ public:
+  DEFINE_STATIC_ATTRIBUTE_EVENT_LISTENER(paymentrequest);
+};
+
+}  // namespace blink
+
+#endif  // PaymentAppServiceWorkerGlobalScope_h