i've got two CLs that depend on each other:
https://chromium-review.googlesource.com/481200
https://chromium-review.googlesource.com/481201

because the tree is throttled, the CQ is only testing a random subset.  so far, it's managed to randomly pick just one, but then reject it at the end because it didn't pick up the other one.
https://uberchromegw.corp.google.com/i/chromeos/builders/master-paladin/builds/14349/steps/CommitQueueSync/logs/stdio/text

we should either include the dep tree of any CLs we picked at random, or we should (silently) add them to the filtered out list.