I'm doing this while trying to figure out the best way to make git-cl
auto-configure itself on first use, including automatic presubmit scripts hook
setup.

TEST=none
BUG=none

Review URL: http://codereview.chromium.org/559002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@37709 0039d316-1c4b-4281-b951-d872f2087c98