In bug 1711724 I plan to turn on canvas.createConicGradient.enabled in
all channels. This was implemented by Aryan Agal in bug 1627014.
Platform coverage: all
Devtools bug: N/A
* Chrome implements this behind a flag.
* WebKit also implemented it recently:
this (there's also another test for OffscreenCanvas, but we don't ship
Let me know if there's any concern with this.