This is a preparation for removal of infra-specific
paths from the recipe engine.

BUG=chromium:605919

Review-Url: https://codereview.chromium.org/1930373002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@300335 0039d316-1c4b-4281-b951-d872f2087c98