code: function(title, ts, opt_args) {
        var thread = this.importer.getOrCreatePseudoThread('gesture').thread;
        thread.sliceGroup.beginSlice(
            'touchpad_gesture', title, ts, opt_args);
      }
docs: Parse events generate by gesture library.
  gestureOpenSlice and gestureCloseSlice are two common
  functions to store the begin time and end time for all
  events in gesture library