You can read the details as anyone else: bernesto has provided a patch that might be enough for some users, but he also said that it has some limitations.
He has been requested to open a new ticket to deal with that feature as that ticket is just about supporting location "out", and it didn't include dealing with frames.
So you can take that patch, try to improve it and share it back (as suggested by Fred, in a new ticket). Dealing with frames is not a priority for the core.
Re: Shared spaces: support for toolbar location 'out'
He has been requested to open a new ticket to deal with that feature as that ticket is just about supporting location "out", and it didn't include dealing with frames.
So you can take that patch, try to improve it and share it back (as suggested by Fred, in a new ticket). Dealing with frames is not a priority for the core.