Add the data attribute to the Notification object

Source/modules/notifications/NotificationOptions.idl

Index: Source/modules/notifications/NotificationOptions.idl
diff --git a/Source/modules/notifications/NotificationOptions.idl b/Source/modules/notifications/NotificationOptions.idl
index 7908a46c2ac8c2368d350cfc4d02234f8282e196..c1e766a9338406fdaadd06eef01263a616bea627 100644
--- a/Source/modules/notifications/NotificationOptions.idl
+++ b/Source/modules/notifications/NotificationOptions.idl
@@ -17,4 +17,5 @@ dictionary NotificationOptions {
     DOMString tag = "";
     DOMString icon;
     boolean silent = false;
+    any data = null;

[Peter Beverloo, 2015/03/10 23:34:26]

While we don't actually generate code for it in the bindings, would you mind
prefixing this with [RuntimeEnabled=] when you add the runtime enabled feature I
noted in a comment slightly further on?

It'll help readability :-).

[Sanghyun Park, 2015/03/11 10:59:52]

I'll add [RuntimeEnabled=NotificationExperimental] like Notification.idl

 };