code: function(traces) {
        var progressMeter = {
          update: function(msg) {}
        };
  
        tr.b.Task.RunSynchronously(
            this.createImportTracesTask(progressMeter, traces));
      }
docs: Imports the provided traces into the model. The eventData type
  is undefined and will be passed to all the importers registered
  via Importer.register. The first importer that returns true
  for canImport(events) will be used to import the events.
  
  The primary trace is provided via the eventData variable. If multiple
  traces are to be imported, specify the first one as events, and the
  remainder in the opt_additionalEventData array.
  
  @param {Array} traces An array of eventData to be imported. Each
  eventData should correspond to a single trace file and will be handled by
  a separate importer.