Add the data attribute to the Notification object

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 537ed26aa7edaf5b6c892db2cc01cd45f72cf586..e979d385c1fce807089a9853ef6dfb6498e46b11 100644
--- a/public/platform/modules/notifications/WebNotificationData.h
+++ b/public/platform/modules/notifications/WebNotificationData.h
@@ -7,6 +7,7 @@
 
 #include "public/platform/WebString.h"
 #include "public/platform/WebURL.h"
+#include "public/web/WebSerializedScriptValue.h"
 
 namespace blink {
 
@@ -35,7 +36,7 @@ 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 WebSerializedScriptValue& data)
         : title(title)
         , direction(direction)
         , lang(lang)
@@ -43,6 +44,7 @@ struct WebNotificationData {
         , tag(tag)
         , icon(icon)
         , silent(silent)
+        , data(data)
     {
     }
 
@@ -53,6 +55,7 @@ struct WebNotificationData {
     WebString tag;
     WebURL icon;
     bool silent;
+    WebSerializedScriptValue data;
 };
 
 } // namespace blink