These configs cover Win/Linux/Mac, debug/release, different
compilers and x86/x64. We will then remove some of the other
testers on the CQ once these are stable.

Bug: chromium:833999
Change-Id: Ibcccd13b02a04e856cd7b051fe872593c2bcc047
Reviewed-on: https://chromium-review.googlesource.com/1040543Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>