Useful debugging information for benchmarks. Also helpful when working
with the command graph to ensure we don't regress performance.

Bug: angleproject:4029
Bug: angleproject:4320
Change-Id: Ibe224c40a3acaca9231bf3869486a0f8bba07ba0
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2036402Reviewed-by: Tim Van Patten <timvp@google.com>
Reviewed-by: Tobin Ehlis <tobine@google.com>
Commit-Queue: Jamie Madill <jmadill@chromium.org>