ImageBufferBackend has functions marked as const when they are not that in practice The object is expected to hold caches and do lazy instantiation. It's not useful to mark the abstract methods const with these expectations.
<rdar://problem/106020570>
Pull request: https://github.com/WebKit/WebKit/pull/10786
Committed 260988@main (fc59b09d8313): <https://commits.webkit.org/260988@main> Reviewed commits have been landed. Closing PR #10786 and removing active labels.