code: function getLayoutScheme() {
          var result = {
              rows: 1,
              columns: 1
          };
  
          if (_orientation === HORIZONTAL) {
              result.rows = 2;
          } else if (_orientation === VERTICAL) {
              result.columns = 2;
          }
  
          return result;
      }
docs: Retrieves the current layout scheme
  @return {!{rows: number, columns: number>}}