Introduce a //content/ API for dispatching notificationclick events.

content/public/common/persistent_notification_status.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 CONTENT_PUBLIC_COMMON_PERSISTENT_NOTIFICATION_STATUS_H_
+#define CONTENT_PUBLIC_COMMON_PERSISTENT_NOTIFICATION_STATUS_H_
+
+namespace content {
+
+// Delivery status for persistent notification clicks to a Service Worker.
+enum PersistentNotificationStatus {
+  // The notificationclick event has been delivered successfully.
+  PERSISTENT_NOTIFICATION_STATUS_SUCCESS = 0,
+
+  // The event could not be delivered because the Service Worker is unavailable.
+  PERSISTENT_NOTIFICATION_STATUS_NO_SERVICE_WORKER,
+
+  // The event could not be delivered because of a Service Worker error.
+  PERSISTENT_NOTIFICATION_STATUS_SERVICE_WORKER_ERROR,
+
+  // The event has been delivered, but the developer extended the event with a
+  // promise that has been rejected.
+  PERSISTENT_NOTIFICATION_STATUS_EVENT_WAITUNTIL_REJECTED
+};
+
+}  // content
+
+#endif  // CONTENT_PUBLIC_COMMON_PERSISTENT_NOTIFICATION_STATUS_H_