Prepare for memory ownership transfer in the GPUProcess.
Created attachment 420855 [details] Patch
Created attachment 420858 [details] Patch
ping review?
Comment on attachment 420858 [details] Patch Thanks for reviewing. I should be able to do ownership transfer for IOSurfaces for the GPUProcess in the next few days.
Committed r273288: <https://commits.webkit.org/r273288> All reviewed patches have been landed. Closing bug and clearing flags on attachment 420858 [details].
<rdar://problem/74619480>