Bug 1039 - Specify behavior of GLEventListener Exceptions occurring while GLAutoDrawable processing [part-2]

In case of an exception thrown within an GLEventListener
called off-thread by Animator:
  - Animator shall stop
  - Animator shall forward the exception

GLDrawableHelper shall also flush all queued GLRunnable tasks
in case of an exception, so that another thread waiting until it's completion
is notified and continues processing.