docs: function() {
        function isStartupSlice(slice) {
          return slice.title === 'BrowserMainLoop::CreateThreads';
        }
        var events = this.modelHelper.browserHelper.getAllAsyncSlicesMatching(
            isStartupSlice);
        var deduper = new tr.model.EventSet();
        events.forEach(function(event) {
          var sliceGroup = event.parentContainer.sliceGroup;
          var slice = sliceGroup && sliceGroup.findFirstSlice();
          if (slice)
            deduper.push(slice);
        });
        return deduper.toArray();
      }