GitLab

The bots occasionally reach 100% usage but most of the time are far
below 100%. https://screenshot.googleplex.com/63y7ueSWyay.png

We can increase to 20% and see the effect.

BUG=855319

Change-Id: I0c2c234d8ef04dc29afce514a39f26856ab20fe2
Reviewed-on: https://chromium-review.googlesource.com/c/1337219Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Reviewed-by: smut <smut@google.com>
Commit-Queue: Simon Que <sque@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608586}