Presubmit: Treat changes with Gerrit-style Tbr: header as TBRed.
Presubmit: Treat changes with Gerrit-style Tbr: header as TBRed.

Bug: 735158
Change-Id: I1444f34c84862f542909d0b70c5cdfd02394526c
Reviewed-on: https://chromium-review.googlesource.com/541638
Reviewed-by: Aaron Gable <bbed39beedae4cdb499af742d2fcd6c63934d93b@chromium.org>
Commit-Queue: Jeremy Roman <05853bd7e6af82658f882905469512bffcab1902@chromium.org>

CoherentLabs/depot_tools,CoherentLabs/depot_tools