Add adhoc conference APIs to RemoteConnection and

RemoteConnectionService.

Plumb through the adhoc conference APIs via these new APIs.

Bug: 159944852
Test: atest CtsTelecomTestCases:RemoteConnectionTest
Change-Id: Icfa27e0616dd35ba350f7a491e5c95337a286b9d

telecomm/java/android/telecom/RemoteConnectionService.java

@@ -31,9 +31,9 @@ import com.android.internal.telecom.RemoteServiceCallback;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.HashSet;
+import java.util.List;
 import java.util.Map;
 import java.util.Set;
-import java.util.List;
 import java.util.UUID;
 
 /**
@@ -573,6 +573,38 @@ final class RemoteConnectionService {
         }
     }
 
+    RemoteConference createRemoteConference(
+            PhoneAccountHandle connectionManagerPhoneAccount,
+            ConnectionRequest request,
+            boolean isIncoming) {
+        final String id = UUID.randomUUID().toString();
+        try {
+            if (mConferenceById.isEmpty()) {
+                mOutgoingConnectionServiceRpc.addConnectionServiceAdapter(mServant.getStub(),
+                        null /*Session.Info*/);
+            }
+            RemoteConference conference = new RemoteConference(id, mOutgoingConnectionServiceRpc);
+            mOutgoingConnectionServiceRpc.createConference(connectionManagerPhoneAccount,
+                    id,
+                    request,
+                    isIncoming,
+                    false /* isUnknownCall */,
+                    null /*Session.info*/);
+            conference.registerCallback(new RemoteConference.Callback() {
+                @Override
+                public void onDestroyed(RemoteConference conference) {
+                    mConferenceById.remove(id);
+                    maybeDisconnectAdapter();
+                }
+            });
+            conference.putExtras(request.getExtras());
+            return conference;
+        } catch (RemoteException e) {
+            return RemoteConference.failure(
+                    new DisconnectCause(DisconnectCause.ERROR, e.toString()));
+        }
+    }
+
     private boolean hasConnection(String callId) {
         return mConnectionById.containsKey(callId);
     }