LayerTreeHost::setShouldNotifyAfterNextScheduledLayerFlush() was used to send the enter accelerated compositing message after the first layer flush. But now that we are always sending the message right after the drawing area is created we no longer need it.
Pull request: https://github.com/WebKit/WebKit/pull/19943
Committed 270172@main (32763a541901): <https://commits.webkit.org/270172@main> Reviewed commits have been landed. Closing PR #19943 and removing active labels.