Bug #24936 introduces a new channel type, Call, which replaces StreamedMedia.

To do automated regression tests on telepathy-qt4 and telepathy-glib, it would be very useful to port this CM to implement the current draft of Call, well before it's considered stable enough to go in telepathy-spec.

Git branch smcv/from-the-future implements an extension library (libfuture-extensions.la), and copies the callable example CM in examples/future/call-cm for porting to Call. It doesn't yet actually *implement* Call (it's still in terms of StreamedMedia), but it does have the right generated-code boilerplate, and it compiles.

It might be useful to merge a prefix of my branch, so we have libfuture-extensions.la even before the example CM has been ported; setting the patch keyword accordingly.