test/sun/java2d/OpenGL/GradientPaints.java

rev 14031 : 8159690: [TESTBUG] Mark headful tests with @key headful.

Backport of 14851:980da45565c8 from jdk9.  542/842 hunks applied directly from
the patch. 44 I resolved manually.  The remaining hunks are for filenames that
do not exist in jdk8u.

*** 21,30 ****
--- 21,31 ----
   * questions.
   */
  
  /*
   * @test
+  * @key headful
   * @bug 6521533 6525997
   * @summary Verifies that the OGL-accelerated codepaths for GradientPaint,
   * LinearGradientPaint, and RadialGradientPaint produce results that are
   * sufficiently close to those produced by the software codepaths.
   * @run main/othervm -Dsun.java2d.opengl=True GradientPaints