This is a hack we have in our local fork as compared to upstream;
work on a generic "hook" system in here is ongoing, but until then,
this is the easiest way to do it.
https://bugzilla.gnome.org/show_bug.cgi?id=700257
This includes a rename from the G* namespace to the Gtk* one, which
will help us with introspecting this code. Note that this removes
some of the custom code we added to GActionMuxer to relay event times
to the remote action group. We'll add this back soon.
https://bugzilla.gnome.org/show_bug.cgi?id=700257
