Possibly due to a driver bug.

BUG=angleproject:1932

Change-Id: I8b10457681c5635b89f898aab09fa244b3bf7d9c
Reviewed-on: https://chromium-review.googlesource.com/616817Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>