To pick up conditional bindings support in LUCI Scheduler.

R=iannucci@chromium.org

Change-Id: I16fd0329db9b4a62cdb067b9e9b1e94ceb48f086
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3419176Reviewed-by: Robbie Iannucci <iannucci@chromium.org>
Commit-Queue: Vadim Shtayura <vadimsh@chromium.org>