Creating connections for conference event package participants.

- Add "addExistingConnection" method to connection service which provides
a way for a connection service to notify telecom of a pre-existing
connection (connections are normally created through telecom).
- Modify TelephonyConferenceController to retrieve its state from a
multiparty connection in the conference (in the case of IMS calls, this
would be the ImsCall that manages the conference) instead of just taking
the first one.

Bug: 18057361
Change-Id: I26993aec54ecb0ce90ae6983fd3eed9d8d0a5773

telecomm/java/android/telecom/RemoteConnectionService.java

@@ -41,8 +41,9 @@ import java.util.UUID;
  */
 final class RemoteConnectionService {
 
+    // Note: Casting null to avoid ambiguous constructor reference.
     private static final RemoteConnection NULL_CONNECTION =
-            new RemoteConnection("NULL", null, null);
+            new RemoteConnection("NULL", null, (ConnectionRequest) null);
 
     private static final RemoteConference NULL_CONFERENCE =
             new RemoteConference("NULL", null);
@@ -286,6 +287,15 @@ final class RemoteConnectionService {
                         .setConferenceableConnections(conferenceable);
             }
         }
+
+        @Override
+        public void addExistingConnection(String callId, ParcelableConnection connection) {
+            // TODO: add contents of this method
+            RemoteConnection remoteConnction = new RemoteConnection(callId,
+                    mOutgoingConnectionServiceRpc, connection);
+
+            mOurConnectionServiceImpl.addRemoteExistingConnection(remoteConnction);
+        }
     };
 
     private final ConnectionServiceAdapterServant mServant =