Will be reused in a test in a following change.

Bug: angleproject:2914
Change-Id: I4e255d5c762f2a6c064b06c558519d82ec6ead5f
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2239085
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Tim Van Patten <timvp@google.com>