8160160: The menu displayed nothing with the option"-server -d64 -Xmixed -Dswing.defaultlaf=com.sun.java.swing.plaf.gtk.GTKLookAndFeel".
Reviewed-by: alexsch, serb

8160448: Make GTK3 menus appearence similar to native.
Reviewed-by: alexsch

8152968: JTree Collapse Buttons Clipped Off Under GTK
Reviewed-by: alexsch

8145547: [AWT/Swing] Conditional support for GTK 3 on Linux
Reviewed-by: prr, alexsch

8153351: GTK Menu's have no border
Reviewed-by: alexsch, serb

8136783: Run blessed-modifier-order script on java.desktop
Reviewed-by: martin, serb

8054834: Modular Source Code
Reviewed-by: alanb, chegar, ihse, mduigou
Contributed-by: alan.bateman@oracle.com, alex.buckley@oracle.com, chris.hegarty@oracle.com, erik.joelsson@oracle.com, jonathan.gibbons@oracle.com, karen.kinnear@oracle.com, magnus.ihse.bursie@oracle.com, mandy.chung@oracle.com, mark.reinhold@oracle.com, paul.sandoz@oracle.com