src/java.desktop/share/classes/sun/swing/SwingAccessor.java

*** 87,96 ****
--- 87,103 ----
      public interface JLightweightFrameAccessor {
          /**
           * Notifies the JLightweight frame that it needs to update a cursor
           */
          void updateCursor(JLightweightFrame frame);
+ 
+         /**
+          * Notifies the JLightweight frame embed to JavaFX stage about
+          * its native toplevel window change
+          */
+ 
+         void overrideNativeWindowHandle(JLightweightFrame frame, long ptr);
      }
  
      /**
       * An accessor for the UIDefaults class.
       */