To pick up correct runtime settings, the GPU sandbox extensions should be sent to the WebContent process as part of the Web page creation parameters.
Created attachment 413585 [details] Patch
Comment on attachment 413585 [details] Patch r=me
Comment on attachment 413585 [details] Patch Thanks for reviewing!
Committed r269647: <https://trac.webkit.org/changeset/269647> All reviewed patches have been landed. Closing bug and clearing flags on attachment 413585 [details].
<rdar://problem/71254916>