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Contrib benchmarks are those that are not supported on the Chrome perf
waterfall but can be manually run by users. This change includes them
in the results of list_benchmarks if the --include-contrib option is
supplied.

Change-Id: Ie09c16888e3bb276dd1f2a9dfe421cf2fbd0e7aa
Reviewed-on: https://chromium-review.googlesource.com/c/1491854Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Commit-Queue: Caleb Rouleau <crouleau@chromium.org>
Auto-Submit: Madeleine Barowsky <mbarowsky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636255}