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Configure tryjobs at the builder definition.

Bug: 1011908
Change-Id: If7135dc07a320e104f997ed5780bde7d5263c886
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1866852Reviewed-by: Aaron Gable <agable@chromium.org>
Commit-Queue: Garrett Beaty <gbeaty@chromium.org>
Auto-Submit: Garrett Beaty <gbeaty@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707128}