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This change enables perf_data_generator to upload results from a
list of benchmarks to the flakiness dashboard.

BUG=chromium:717394

Change-Id: I3952887c527c40fb5d061e9ee8aa4875794075c7
Reviewed-on: https://chromium-review.googlesource.com/574687
Commit-Queue: Ashley Enstad <ashleymarie@chromium.org>
Reviewed-by: Ned Nguyen <nednguyen@google.com>
Cr-Commit-Position: refs/heads/master@{#487310}