test/javax/swing/JFrame/HangNonVolatileBuffer/HangNonVolatileBuffer.java

rev 14031 : 8160974: [TESTBUG] Mark more headful tests with @key headful.

This is a backport of fe58d505fffd from jdk9. 228/596 hunks apply without
modifications. 16 hunks required manual rework. The remainder were for files
not present in jdk8u.

*** 26,35 ****
--- 26,36 ----
  import javax.swing.JFrame;
  import javax.swing.SwingUtilities;
  
  /**
   * @test
+  * @key headful
   * @bug 8029455
   * @summary Swing should not hang if non-volatile image is used as a backbuffer.
   * @run main/othervm -Dswing.volatileImageBufferEnabled=false HangNonVolatileBuffer
   */
  public final class HangNonVolatileBuffer {