With UI-side compositing, we see more layouts happening while scrolling than without. These layouts are triggered by frameview::updateLayoutViewport() when it computes a new layout viewport origin.
<rdar://problem/106535756>
Pull request: https://github.com/WebKit/WebKit/pull/11346
Committed 261504@main (7fe0d61af392): <https://commits.webkit.org/261504@main> Reviewed commits have been landed. Closing PR #11346 and removing active labels.