Deliver action clicks to page notifications (blink)

Source/modules/notifications/PageNotificationEventInit.idl

Index: Source/modules/notifications/PageNotificationEventInit.idl
diff --git a/Source/modules/notifications/PageNotificationEventInit.idl b/Source/modules/notifications/PageNotificationEventInit.idl
new file mode 100644
index 0000000000000000000000000000000000000000..1b8d62eb418216155ac3d611f0e15c40f881c414
--- /dev/null
+++ b/Source/modules/notifications/PageNotificationEventInit.idl
@@ -0,0 +1,10 @@
+// Copyright 2015 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://notifications.spec.whatwg.org/#pagenotificationevent
+
+dictionary PageNotificationEventInit : EventInit {
+    [RuntimeEnabled=NotificationExperimental] Notification notification;
+    [RuntimeEnabled=NotificationExperimental] DOMString action = "";
+};