We've received a few requests from Blink engineers to set up a "staging" WPT directory in LayoutTests but outside of external/wpt to have WPT features enabled (especially wptserve) for:
* tests that are being worked on and not ready to be upstreamed (yet)
* tests that use or test Chrome internals which are not suitable for upstreaming but can benefit from wptserve features
It was actually a P3 KR a while ago, also related to issue 347864 (dropping Apache altogether and switching to wptserve), but we haven't got around to work on it. Filing an issue so that we don't forget.
Comment 1 by robertma@chromium.org
, Jun 18 2018