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See https://cs.chromium.org/chromium/src/testing/scripts/run_performance_tests.py?l=201

I used the wrong arg in
https://chromium-review.googlesource.com/c/chromium/src/+/1428090
but it didn't break because the logic doesn't yet require this
argument.

BUG=924351

Change-Id: I69f7fc5bfbd01537f8d99ace53b64d73386bf96f
Reviewed-on: https://chromium-review.googlesource.com/c/1433292
Auto-Submit: Caleb Rouleau <crouleau@chromium.org>
Reviewed-by: Ben Pastene <bpastene@chromium.org>
Commit-Queue: Caleb Rouleau <crouleau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#625765}