Was found when using the custom test harness.

Bug: angleproject:3162
Change-Id: I9db11eddb51508ff1eaebe02c106cd4a95c369b1
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1932342Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>