modules/javafx.web/src/main/java/com/sun/webkit/UIClient.java

@@ -49,9 +49,9 @@
     public void startDrag(
             WCImage frame,
             int imageOffsetX, int imageOffsetY,
             int eventPosX, int eventPosY,
             String[] mimeTypes, Object[] values,
-            boolean isImageSource);
+            boolean isImageSource, String imageFileExt);
     public void confirmStartDrag();
     public boolean isDragConfirmed();
 }