Set isTile for remote layers so exposedUnfilledArea() can find the list of tiles
Pull request: https://github.com/WebKit/WebKit/pull/7218
<rdar://problem/103037867>
Committed 257447@main (d8d7eb833907): <https://commits.webkit.org/257447@main> Reviewed commits have been landed. Closing PR #7218 and removing active labels.