Fire callback immediately if original connection already exists.

In the case of an incoming call, the callback will be registered
after original connection is already set. If this is the case, let's
just fire back the callback immediately so the connection
is added to the conference controller.

Bug: 18056632
Bug: 18240234
Change-Id: I3996ee3763535aff209f7486f78a0f4889482cbe
1 file changed