BUG=chromium-os:37471
TEST=manual invocations, tracking upstream code, running these
     versions on builders for validation in addition.

Review URL: https://chromiumcodereview.appspot.com/11660027

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@174609 0039d316-1c4b-4281-b951-d872f2087c98