Expose the notificationclick and notificationerror events on ServiceWorkerGlobalScope

Source/modules/notifications/ServiceWorkerGlobalScopeNotifications.h

+// Copyright 2014 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 ServiceWorkerGlobalScopeNotifications_h
+#define ServiceWorkerGlobalScopeNotifications_h
+
+#include "core/events/EventTarget.h"
+
+namespace blink {
+
+class ServiceWorkerGlobalScopeNotifications {
+public:
+    DEFINE_STATIC_ATTRIBUTE_EVENT_LISTENER(notificationclick);
+    DEFINE_STATIC_ATTRIBUTE_EVENT_LISTENER(notificationerror);
+};
+
+} // namespace blink
+
+#endif // ServiceWorkerGlobalScopeNotifications_h