This is useful for large repos (like src.git)

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

Review URL: https://codereview.chromium.org/270503003

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@269079 0039d316-1c4b-4281-b951-d872f2087c98