Now that WebRender can handle splitting scrolling layers on its own, we don't need to do any work to split up scroll roots. This should also make it possible to handle overflow:scroll and containing block scroll roots in the future.
Now that WebRender can handle splitting scrolling layers on its own, we don't need to do any work to split up scroll roots. This should also make it possible to handle overflow:scroll and containing block scroll roots in the future.
