We should upstream this fix to dEQP once we have the chance.

BUG=chromium:759402

Change-Id: I64e5df9bc6552e6fabe2b4b60c877fa30fd4c1f2
Reviewed-on: https://chromium-review.googlesource.com/670101
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>