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For the warm story we avoid flushing caches. Metrics will need more
polishing for properly omitting the first result. This should be done
for the cold benchmark as well, hence we'd still have a good separation
between the benchmark driver and the metrics.

Bug: 760498
Change-Id: Ie061852bd1c8893f5ea57b67c85a383bedf26a7c
Reviewed-on: https://chromium-review.googlesource.com/1203936Reviewed-by: Ned Nguyen <nednguyen@google.com>
Commit-Queue: Egor Pasko <pasko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#588829}