This will be used on the bots when calling apply_patch, which commits to git
repos.

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

Review URL: https://chromiumcodereview.appspot.com/18006002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@209040 0039d316-1c4b-4281-b951-d872f2087c98