For a bit of context, see the TODO in the code --
I think that the original intent of that TODO was that we to make
the way that CQ dry runs are triggered consistent, and also make
the behavior of dry runs consistent across different commands.

Change-Id: I80dfc31ade302a6af7fa84011e2871d416ea9c96
Reviewed-on: https://chromium-review.googlesource.com/518930
Commit-Queue: Quinten Yearsley <qyearsley@chromium.org>
Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>