This will allow the test step to fail when run in CI.

Bug: angleproject:5530
Change-Id: I7c156438ded82aa7191b8b597a9a52200c0efe57
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2638989
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Tim Van Patten <timvp@google.com>
Reviewed-by: Cody Northrop <cnorthrop@google.com>