[WIP] add "auto" attr in notifications

Source/modules/notifications/Notification.h

Index: Source/modules/notifications/Notification.h
diff --git a/Source/modules/notifications/Notification.h b/Source/modules/notifications/Notification.h
index 1f780a0a9bfdd265eb3e0c2c89bc3e0ed2ae1cb6..1f708f1d0ecebd7dfde75f91139de558124c05c3 100644
--- a/Source/modules/notifications/Notification.h
+++ b/Source/modules/notifications/Notification.h
@@ -90,10 +90,10 @@ public:
     bool silent() const { return m_silent; }
     ScriptValue data(ScriptState*) const;
 
-    TextDirection direction() const;
     KURL iconURL() const { return m_iconUrl; }
     SerializedScriptValue* serializedData() const { return m_serializedData.get(); }
 
+    static WebNotificationData directionStringToEnum(String direction);
     static String permissionString(WebNotificationPermission);
     static String permission(ExecutionContext*);
     static WebNotificationPermission checkPermission(ExecutionContext*);