How to use the @swim/view.View.NeedsScroll function in @swim/view

this.doCompute(layerViewContext);
    }
    if (((updateFlags | this._updateFlags) & View.NeedsAnimate) !== 0) {
      this._updateFlags = this._updateFlags & ~View.NeedsAnimate;
      this.doAnimate(layerViewContext);
    }
    if (((updateFlags | this._updateFlags) & MapView.NeedsProject) !== 0) {
      this._updateFlags = this._updateFlags & ~MapView.NeedsProject;
      this.doProject(layerViewContext);
    }
    if (((updateFlags | this._updateFlags) & View.NeedsLayout) !== 0) {
      this._updateFlags = this._updateFlags & ~View.NeedsLayout;
      this.doLayout(layerViewContext);
    }
    if (((updateFlags | this._updateFlags) & View.NeedsScroll) !== 0) {
      this._updateFlags = this._updateFlags & ~View.NeedsScroll;
      this.doScroll(layerViewContext);
    }
    if (((updateFlags | this._updateFlags) & View.NeedsRender) !== 0) {
      this._updateFlags = this._updateFlags & ~View.NeedsRender;
      this.doRender(layerViewContext);
    }
    this.onUpdate(layerViewContext);
    this.doUpdateChildViews(updateFlags, layerViewContext);
    this.didUpdate(layerViewContext);
  }

this._updateFlags = this._updateFlags & ~View.NeedsCompute;
      this.doCompute(layerViewContext);
    }
    if (((updateFlags | this._updateFlags) & View.NeedsAnimate) !== 0) {
      this._updateFlags = this._updateFlags & ~View.NeedsAnimate;
      this.doAnimate(layerViewContext);
    }
    if (((updateFlags | this._updateFlags) & MapView.NeedsProject) !== 0) {
      this._updateFlags = this._updateFlags & ~MapView.NeedsProject;
      this.doProject(layerViewContext);
    }
    if (((updateFlags | this._updateFlags) & View.NeedsLayout) !== 0) {
      this._updateFlags = this._updateFlags & ~View.NeedsLayout;
      this.doLayout(layerViewContext);
    }
    if (((updateFlags | this._updateFlags) & View.NeedsScroll) !== 0) {
      this._updateFlags = this._updateFlags & ~View.NeedsScroll;
      this.doScroll(layerViewContext);
    }
    if (((updateFlags | this._updateFlags) & View.NeedsRender) !== 0) {
      this._updateFlags = this._updateFlags & ~View.NeedsRender;
      this.doRender(layerViewContext);
    }
    this.onUpdate(layerViewContext);
    this.doUpdateChildViews(updateFlags, layerViewContext);
    this.didUpdate(layerViewContext);
  }