This doesn't work and is highly misleading as the tests run with the real
GPU.

Bug: angleproject:4353
Change-Id: Id9139436e39d5e8e063bcc679b7c63f589d3b748
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2023912
Commit-Queue: Michael Spang <spang@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>