Reason: so I can not lgtm/revert anything which doesn't come with
more tests.

R=iannucci@chromium.org,dpranke@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1873403004

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@299921 0039d316-1c4b-4281-b951-d872f2087c98