Hoist the IOSurfacePool out of IOSurface
Created attachment 456378 [details] Patch
Created attachment 456385 [details] Patch
Created attachment 456407 [details] Patch
Committed r292249 (249147@main): <https://commits.webkit.org/249147@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 456407 [details].
<rdar://problem/91191170>