Includes some tests for EXT_debug_marker

https://android.googlesource.com/platform/external/deqp/+log/9b4161..554adf1

BUG=None

Change-Id: I911fcb5577caefaa1fe3479445146a2b3f819124
Reviewed-on: https://chromium-review.googlesource.com/277140Reviewed-by: Austin Kinross <aukinros@microsoft.com>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>