Enable the 'gpu_process_canvas_rendering' feature flag.
rdar://75799739
Created attachment 424294 [details] Patch
(I started a thread about the other two platforms)
Created attachment 424299 [details] Patch
Committed r275068: <https://commits.webkit.org/r275068> All reviewed patches have been landed. Closing bug and clearing flags on attachment 424299 [details].
<rdar://58057265>