Many, many times this has burned me badly; if you have a dirty index,
git try will just upload your commits, and not the index.

R=nsylvain@chromium.org
BUG=None

Review URL: https://chromiumcodereview.appspot.com/10836180

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@151202 0039d316-1c4b-4281-b951-d872f2087c98