hg: jdk9/client/jdk: 8022334: After calling frame.toBack() dialog goes to the back on Ubuntu 12.04

[semyon.sadetsky at oracle.com]

Changeset: 7993027bcb2f
Author:    ssadetsky
Date:      2015-10-20 15:59 +0300
URL:       http://hg.openjdk.java.net/jdk9/client/jdk/rev/7993027bcb2f

8022334: After calling frame.toBack() dialog goes to the back on Ubuntu 12.04
Reviewed-by: alexsch, serb

! src/java.desktop/unix/classes/sun/awt/X11/XWindow.java
+ test/java/awt/Window/MultiWindowApp/MultiWindowAppTest.java