PROGRESSION (263656@main): Three fast/scrolling/mac/scrollbars are a consistent failure or timeout
<rdar://problem/111424377>
Pull request: https://github.com/WebKit/WebKit/pull/15379
*** Bug 258639 has been marked as a duplicate of this bug. ***
*** Bug 258640 has been marked as a duplicate of this bug. ***
*** Bug 212042 has been marked as a duplicate of this bug. ***
*** Bug 215611 has been marked as a duplicate of this bug. ***
*** Bug 215700 has been marked as a duplicate of this bug. ***
Committed 265728@main (62eb15f04810): <https://commits.webkit.org/265728@main> Reviewed commits have been landed. Closing PR #15379 and removing active labels.