[9] Review request for 8169309: Migrate SwingNode to the new float API of JLightweightFrame

[Semyon Sadetsky]

Hello Kevin & Jim,

Please review the fix for jfx9:

webrev: http://cr.openjdk.java.net/~ssadetsky/8169309/webrev.00/

bug: https://bugs.openjdk.java.net/browse/JDK-8153522

--Semyon