code: function setLayoutScheme(rows, columns) {
          if ((rows < 1) || (rows > 2) || (columns < 1) || (columns > 2) || (columns === 2 && rows === 2)) {
              console.error("setLayoutScheme unsupported layout " + rows + ", " + columns);
              return false;
          }
  
          if (rows === columns) {
              _mergePanes();
          } else if (rows > columns) {
              _doSplit(HORIZONTAL);
          } else {
              _doSplit(VERTICAL);
          }
          return true;
      }
docs: Changes the layout scheme
  @param {!number} rows (may be 1 or 2)
  @param {!number} columns (may be 1 or 2)
  @summay Rows or Columns may be 1 or 2 but both cannot be 2. 1x2, 2x1 or 1x1 are the legal values