Things that seem to be missing: 1. Ability to have one bundle for both APIs (there's a patch in bug 136910). 2. An InjectedBundle/InjectedBundleController/InjectedBundleTest for the modern API (and move the old ones to Legacy* or some such). I've started hacking this up.
3. Some non-deprecated way to set the Injected Bundle initialization userdata (we have http://trac.webkit.org/changeset/148376/trunk/Source/WebKit2/UIProcess/API/mac/WKProcessGroup.h but I guess WKProcessGroup is deprecated?).
Created attachment 238299 [details] useless wip patch attaching a useless WIP, because I'm not sure what to do about #3.
Hasn’t this been done?