Add the ChromeOS trybot to the CQ config.
Add the ChromeOS trybot to the CQ config.

BUG=angleproject:1347

Change-Id: I93266da474909352a4b83de52cffde82687bda86
Reviewed-on: https://chromium-review.googlesource.com/346735
Commit-Queue: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>
Reviewed-by: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>

ppy/angle,MSOpenTech/angle,ecoal95/angle,ecoal95/angle,ecoal95/angle,ecoal95/angle,ppy/angle,MSOpenTech/angle,MSOpenTech/angle,ecoal95/angle,MSOpenTech/angle,ppy/angle,domokit/waterfall,ppy/angle,domokit/waterfall