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Turns on the --experimental-proto-trace-format flag to test proto trace
generation on bots. Uses the power.desktop benchmark to test metrics
computation.

TBR=crouleau@chromium.org

Bug: 990304
Change-Id: If9a2595a7e41a824d1f23638337806747782b319
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1939968
Commit-Queue: Mikhail Khokhlov <khokhlov@google.com>
Auto-Submit: Mikhail Khokhlov <khokhlov@google.com>
Reviewed-by: Juan Antonio Navarro Pérez <perezju@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720163}