Add register methods used by PhoneApp into CallManager class. For most register methods, CallManager acts as an pass-through register to handle register and unregister phone case. Change-Id: I74ce4e6d8e66f49c12b43bae1b0def0c7597a449
Add register methods used by PhoneApp into CallManager class. For most register methods, CallManager acts as an pass-through register to handle register and unregister phone case. Change-Id: I74ce4e6d8e66f49c12b43bae1b0def0c7597a449