Will be used in restricted trace testing.

Bug: angleproject:4090
Bug: b/168049670
Change-Id: I0931a974c665dd8f8cf557c8af3bdc6e2fdc2544
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2431776
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>