Needed for https://codereview.chromium.org/1922503002

BUG=chromium:585401

Review URL: https://codereview.chromium.org/1917803002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@300135 0039d316-1c4b-4281-b951-d872f2087c98