[Monocle] Stage properties (FullScreen, Minimize) tests failed

Minimize and Full Screen functionality does not work on monocle executing.

To reproduce:
1.execute sanity
2.Windows
3.Open new window
4.try Minimize , full screen - it does not function as expected.

FX build under testing:
http://jfx.us.oracle.com/hudson/job/8u-dev/501/label=linux-arm-30/artifact/