[7u6] Request for approval for 7168550: [macosx] duplicate OGL context state changes related to vertex cache

[Dmitry Cherepanov]

This is a request to push the following fix:

Bug: http://bugs.sun.com/view_bug.do?bug_id=7168550

Webrev: http://cr.openjdk.java.net/~dcherepanov/7168550/7u6/webrev.0/

Technical review: 
http://mail.openjdk.java.net/pipermail/macosx-port-dev/2012-May/004264.html

Thanks,
Dmitry