[9] Review request for 8117886: There is no tooltip while moving the mouse on the tray icon.

[Semyon Sadetsky]

Hello,

Please review fix for JDK9:
bug: https://bugs.openjdk.java.net/browse/JDK-8117886

webrev: http://cr.openjdk.java.net/~ssadetsky/8117886/webrev.00/

gnome3 DE got a new DE notifications bar, so the tooltips for tray icons 
have gone.

Just note about that in the TrayIcon's javadoc.

--Semyon