Tyler Gunn 3bffcf78b5 Communicating participant changes to conference controller.
- Add new ConferenceParticipant parcelable class which represents a
single participant contained in the conference event package.
- Adding callbacks/listeners to Connection to handle changes to
participant state.

Bug: 18057361
Change-Id: Iadfebe84959f30f8e835f282aa994c0b92768aa6
2014-10-28 13:51:27 -07:00
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