Given a Scenic
BufferCollectionImportToken, returns a new version which has been duplicated.
BufferCollectionToken.Duplicate()on the provided token, passing the server end of a newly-instantiated channel. Then, calls
Sync()on the provided token, so that the returned token is safe to use immediately (i.e. the server has acknowledged that the duplication has occurred).
Given a ViewRef, returns a new version which has been duplicated.