[9, 8u] Review request for 8087565: Scaling problem on OSX Retina

[Jim Graham]

Same patch applies to both (modulo source code paths).

jbs: https://bugs.openjdk.java.net/browse/JDK-8087565
8u webrev: http://cr.openjdk.java.net/~flar/JDK-8087565/webrev.8u.00/
9u webrev: http://cr.openjdk.java.net/~flar/JDK-8087565/webrev.9u.00/

This is a minor improvement on the earlier fix for JDK-8145516 to ensure that we communicate the scale of a newly mapped 
view to the FX code regardless of how the window/view are made visible...

			...jim