8u40 (already reviewed) post-push notification: RT-36566 - make vram target limit more dynamic

[Jim Graham]

Kevin already reviewed this fix during a discussion on the Jira issue 
(see the comments), but I realized after I pushed that I never sent out 
a public request for reviews to the list...

Jira: https://javafx-jira.kenai.com/browse/RT-36566
webrev: http://cr.openjdk.java.net/~flar/RT-36566/webrev.02/
There was one minor change after that webrev which was to make 2 new 
variables final as per the final +1 review comment...

                        ...jim