code: function emitTraceTracker() {
      var now = wtf.now();
      var tracingScope = wtf.trace.enterTracingScope(now);
  
      var syncName = '$WTFTRACE:' + Math.floor(now * 1000);
      // TODO(benvanik): use timestamp instead
      consoleTime.call(goog.global.console, syncName);
      consoleTimeEnd.call(goog.global.console, syncName);
  
      wtf.trace.leaveScope(tracingScope);
    }
docs: TODO(benvanik): fix chrome so that this isn't required. This function should be called periodically to insert special events into the chrome:tracing stream that let us identify our thread and the time delta on timestamps used. We do the tracing scope so that the user won't get confused when they see the setInterval dispatch in the native zone.