Request for review 7154516: [macosx] Popup menus have no visible borders

[Dmitry Cherepanov]

Hello,

Here's a temporary fix for 7154516. The problem with borders caused by 
known unresolved issue (7124236) and the proposed change temporarily 
makes popups opaque to enable shadows for popups.

http://cr.openjdk.java.net/~dcherepanov/7154516/webrev.0/

Thanks,
Dmitry