docs: function(eventName, cpuNumber, pid,
                              ts, eventBase) {
        var event = syncTimelineRE.exec(eventBase.details);
        if (!event)
          return false;
  
        var thread = this.importer.getOrCreatePseudoThread(event[1]);
  
        if (thread.lastActiveTs !== undefined) {
          var duration = ts - thread.lastActiveTs;
          var value = thread.lastActiveValue;
          if (value == undefined)
            value = ' ';
          var slice = new tr.model.Slice(
              '', value,
              ColorScheme.getColorIdForGeneralPurposeString(value),
              thread.lastActiveTs, {},
              duration);
          thread.thread.sliceGroup.pushSlice(slice);
        }
        thread.lastActiveTs = ts;
        thread.lastActiveValue = event[2];
        return true;
      }