[9] Review request for JDK-8146920: [hidpi] Multi-Monitor issue with HiDpi scaling and undecorated stages

[Jim Graham]

JBS: https://bugs.openjdk.java.net/browse/JDK-8146920
webrev: http://cr.openjdk.java.net/~flar/JDK-8146920/webrev.03/

Details are in the JBS comments.

I'm tagging Kevin here on the review, but any engineers with more than a passing familiarity with Glass should review 
the changes as it represents a significant shift in how we manage window bounds, screens, and bookkeeping for the 
platform coordinate scales on Windows platforms.

Having said that, the code change is not huge, it's more that the notifications and actions are now tied into different 
WM_ event streams...

			...jim