GraphicsContextFlushIdentifier is defined in wrong layer WebCore::ImageBuffer::didFlush(GraphicsContextFlushIdentifier) is not used in WebCore. It is feature of one particular implementation, WebKit::RemoteDisplayListRecorder.
<rdar://problem/101674440>
Pull request: https://github.com/WebKit/WebKit/pull/5901
Committed 256127@main (411c08513581): <https://commits.webkit.org/256127@main> Reviewed commits have been landed. Closing PR #5901 and removing active labels.