static setFixedEdges(updatedFixedEdges) {
    fixedEdges.top = !!updatedFixedEdges.top;
    fixedEdges.bottom = !!updatedFixedEdges.bottom;
    fixedEdges.left = !!updatedFixedEdges.left;
    fixedEdges.right = !!updatedFixedEdges.right;
  }
Sets which edges are fixed. This does not prevent fixed edges set by
no scrollbars or single-direction scrollbars.
@param {!FixedEdgesConfig} updatedFixedEdges The edges to set as fixed.
@public