static TimelineEventRecorder* CreateTimelineRecorder() {
  const bool use_endless_recorder =
      (FLAG_timeline_dir != NULL) || FLAG_timing || FLAG_complete_timeline;

  const bool use_startup_recorder = FLAG_startup_timeline;
  const bool use_systrace_recorder = FLAG_systrace_timeline;
  const char* flag = FLAG_timeline_recorder;

  if (use_systrace_recorder || (flag != NULL)) {
    if (use_systrace_recorder || (strcmp("systrace", flag) == 0)) {
#if defined(HOST_OS_LINUX) || defined(HOST_OS_ANDROID)
      return new TimelineEventSystraceRecorder();
#elif defined(HOST_OS_FUCHSIA)
      return new TimelineEventFuchsiaRecorder();
#else
      OS::PrintErr(
          "Warning: The systrace timeline recorder is equivalent to the"
          "ring recorder on this platform.");
      return new TimelineEventRingRecorder();
#endif
    }
  }

  if (use_endless_recorder || (flag != NULL)) {
    if (use_endless_recorder || (strcmp("endless", flag) == 0)) {
      return new TimelineEventEndlessRecorder();
    }
  }

  if (use_startup_recorder || (flag != NULL)) {
    if (use_startup_recorder || (strcmp("startup", flag) == 0)) {
      return new TimelineEventStartupRecorder();
    }
  }
  return new TimelineEventRingRecorder();
}