8160974: [TESTBUG] Mark more headful tests with @key headful.
Reviewed-by: serb, simonis

8063106: Change open swing regression tests to avoid sun.awt.SunToolkit.realSync, part 1
Reviewed-by: pchelko, serb

8048110: Using tables in JTextPane leads to infinite loop in FlowLayout.layoutRow
Reviewed-by: alexp, alexsch