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This will increase the load. We can adjust the overall load by turning
individual builders on/off.

R=tikuta@chromium.org, ukai@chromium.org, yyanagisawa@chromium.org

Bug: 945731
Change-Id: I30792178e164acc210785d3a7670e0b0159de996
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1539489
Commit-Queue: Simon Que <sque@chromium.org>
Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#644685}