docs: function(event, flowEvents) {
        if (event.outFlowEvents === undefined ||
            event.outFlowEvents.length === 0)
          return false;
  
        // Once we fix the bug of flow event binding, there should exist one and
        // only one outgoing flow (PostTask) from ScheduleBeginImplFrameDeadline
        // and PostComposite.
        var flow = event.outFlowEvents[0];
  
        if (flow.category !== POSTTASK_FLOW_EVENT ||
            !flow.endSlice)
          return false;
  
        var endSlice = flow.endSlice;
        if (this.belongToOtherInputs(endSlice.mostTopLevelSlice, flowEvents))
          return true;
  
        return false;
      }