The expected behavior is that for CLs that were already uploaded
before, where some tryjobs were run and failed, git cl upload
--retry-failed will be kind of like git cl upload --cq-dry-run
except it will only trigger tryjobs that failed.

Bug: 985887
Change-Id: I6371bca3ba501b1ea2cd7160e2f933530d7e633f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1828322
Auto-Submit: Quinten Yearsley <qyearsley@chromium.org>
Commit-Queue: Andrii Shyshkalov <tandrii@google.com>
Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>