[9] Review request for 8170386: JLightweightFrame content can miss paint events on Windows

[Semyon Sadetsky]

Hello,

Please review fix for JDK9:
bug: https://bugs.openjdk.java.net/browse/JDK-8170386

webrev: http://cr.openjdk.java.net/~ssadetsky/8170386/webrev.00/

Paint event may be missed by the JLightweightFrame on Windows platform 
when it is resized consequently to the same size because the latter sets 
paintPainding flag .

The fix overrides WComponentPeer#setBounds() method in 
WLightweightFramePeer to clears paintPainding flag.

--Semyon