8159690: [TESTBUG] Mark headful tests with @key headful.
Reviewed-by: simonis, alexsch
<html>
<!--
@test
@key headful
@bug 6260648
@summary Tests that WINDOW_DESTROY event can be handled by overriding handleEvent(). Also,
tests that handleEvent() is not called by AWT if any listener is added to the component
(i. e. when post-1.1 events schema is used)
@author artem.ananiev: area=awt.event
@run applet HandleWindowDestroyTest.html
-->
<head>
<title> </title>
</head>
<body>
<h1>HandleWindowDestroyTest<br>Bug ID: 6260648</h1>
<p> This is an AUTOMATIC test, simply wait for completion </p>
<APPLET CODE="HandleWindowDestroyTest.class" WIDTH=200 HEIGHT=200></APPLET>
</body>
</html>