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This trybot mirrors the existing waterfall builder of the same name.

Bug: 1115229
Change-Id: I5355e563437846b0f1ec310f2487f243aee20c83
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2376876
Commit-Queue: Haiyang Pan <hypan@google.com>
Reviewed-by: Erik Staab <estaab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801905}