This can be useful for debugging and also for perf tests. The perf
tests output gets scraped from stdout.

Bug: angleproject:5124
Change-Id: Id5005df3f2b66be9497a9ba422abd47b95a1a330
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2486097Reviewed-by: Tim Van Patten <timvp@google.com>
Reviewed-by: Courtney Goeltzenleuchter <courtneygo@google.com>
Commit-Queue: Jamie Madill <jmadill@chromium.org>