docs: function GestureParser(importer) {
      Parser.call(this, importer);
      importer.registerEventHandler('tracing_mark_write:log',
          GestureParser.prototype.logEvent.bind(this));
      importer.registerEventHandler('tracing_mark_write:SyncInterpret',
          GestureParser.prototype.syncEvent.bind(this));
      importer.registerEventHandler('tracing_mark_write:HandleTimer',
          GestureParser.prototype.timerEvent.bind(this));
    }