There's a lot more that can go into this perf test, but it requires
further work on the Vulkan back end.

Bug: angleproject:2999
Change-Id: Iea62bfd09639af108674dcf0a9e7c9d36ccddcef
Reviewed-on: https://chromium-review.googlesource.com/c/1437734
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>