Use initializers, and avoid using a CoreAnimation enum in edgeAntialiasingMask.
<rdar://problem/102450702>
Pull request: https://github.com/WebKit/WebKit/pull/6581
Committed 256815@main (606c220f2c38): <https://commits.webkit.org/256815@main> Reviewed commits have been landed. Closing PR #6581 and removing active labels.