[9] Review request for 8064468 ownedWindowList access requires synchronization in Window.setAlwaysOnTop() method

[Alexander Scherbatiy]

Hello,
Could you review the fix:
  bug: https://bugs.openjdk.java.net/browse/JDK-8064468
  webrev: http://cr.openjdk.java.net/~alexsch/8064468/webrev.00

  The fix uses the copy of the owned windows list to avoid the 
synchronization issue.

Thanks,
Alexandr.