We can pass the node hash directly to RemoteLayerTreePropertyApplier. The collection step doesn't seem to add anything except an extra hash lookup.
Created attachment 355720 [details]
Comment on attachment 355720 [details]
Clearing flags on attachment: 355720
Committed r238549: <https://trac.webkit.org/changeset/238549>
All reviewed patches have been landed. Closing bug.