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It's got the same bot pool size as the linux version of it, so jumping
from 0 to 50% should be safe.

The bot should be good to go once https://chromium-review.googlesource.com/c/chromium/tools/build/+/1287370 lands.

Bug: 893614
Change-Id: Ib6abc77bec199866dacadc0078afd50df387d0c8
Reviewed-on: https://chromium-review.googlesource.com/c/1287432Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600812}