Make connection events work for conferences

Pipe through the onConnectionEvent call between the conference host
connection and the android.telecom.Conference object.

Fixes: 130404376
Test: manual
Change-Id: Ifad3e59dc9764aa2efb2b9766271e18853bf1c76

telecomm/java/android/telecom/ConnectionService.java

@@ -1279,6 +1279,14 @@ public abstract class ConnectionService extends Service {
                 mAdapter.setCallerDisplayName(id, callerDisplayName, presentation);
             }
         }
+
+        @Override
+        public void onConnectionEvent(Conference c, String event, Bundle extras) {
+            String id = mIdByConference.get(c);
+            if (id != null) {
+                mAdapter.onConnectionEvent(id, event, extras);
+            }
+        }
     };
 
     private final Connection.Listener mConnectionListener = new Connection.Listener() {