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We have Blink layout test bots on 3 different platforms using the
{blink_downstream} recipe. {chromium_integration} uses src-side definitions for
compilation and blink tests.

This CL creates the src-side bot definitions for Chromium integration with Blink
Layout tests.

R=machenbach@chromium.org
TBR=jbudorick@chromium.org

Bug: chromium:883629
Change-Id: I5b303b1d1dd26cc4a2b3804a8e762b69020069df
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1736680
Commit-Queue: Tamer Tas <tmrts@chromium.org>
Auto-Submit: Tamer Tas <tmrts@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#684327}