When I need to view the platform event and flutter event at the same time, I will change timeline record to systrace. But sync event is not included in the systrace.

for example , in Flutter framework , lib/src/widgets/framework.dart

void buildScope(Element context, [ VoidCallback callback ]) {
    Timeline.startSync('Build', arguments: timelineWhitelistArguments);
    ...
    Timeline.finishSync();
}

1. build event don't included in the systrace
   

2. with this CL, we can see it