Add data property in persistent web notification

public/platform/modules/notifications/WebNotificationData.h

Index: public/platform/modules/notifications/WebNotificationData.h
diff --git a/public/platform/modules/notifications/WebNotificationData.h b/public/platform/modules/notifications/WebNotificationData.h
index 5b825d1598fbfd12cbfeebf3379122d578a513a3..26ba104c239e8f850303bacf23b9d123969b0441 100644
--- a/public/platform/modules/notifications/WebNotificationData.h
+++ b/public/platform/modules/notifications/WebNotificationData.h
@@ -23,7 +23,7 @@ struct WebNotificationData {
     {
     }
 
-    WebNotificationData(const WebString& title, Direction direction, const WebString& lang, const WebString& body, const WebString& tag, const WebURL& icon, bool silent)
+    WebNotificationData(const WebString& title, Direction direction, const WebString& lang, const WebString& body, const WebString& tag, const WebURL& icon, bool silent, const WebString& dataAsWireString)
         : title(title)
         , direction(direction)
         , lang(lang)
@@ -31,6 +31,7 @@ struct WebNotificationData {
         , tag(tag)
         , icon(icon)
         , silent(silent)
+        , dataAsWireString(dataAsWireString)
     {
     }
 
@@ -41,6 +42,7 @@ struct WebNotificationData {
     WebString tag;
     WebURL icon;
     bool silent;
+    WebString dataAsWireString;

[Sanghyun Park, 2015/03/15 14:23:55]

I think that there is no necessity for using WebSerializedScrtiptValue.
Because  chromium will only store data's WireString without other action.
What do you think about this?

 };
 
 } // namespace blink