Intent to Ship: CanvasRenderingContext2D.createConicGradient.

[Emilio Cobos Álvarez]

Hi,

In bug 1711724 I plan to turn on canvas.createConicGradient.enabled in
all channels. This was implemented by Aryan Agal in bug 1627014.

Standard: https://html.spec.whatwg.org/#dom-context-2d-createconicgradient

Platform coverage: all

Preference: canvas.createConicGradient.enabled

Devtools bug: N/A

Other browsers:

* Chrome implements this behind a flag.
* WebKit also implemented it recently:
https://bugs.webkit.org/show_bug.cgi?id=225539

web-platform-tests:
html/canvas/element/fill-and-stroke-styles/2d.gradient.conic.html tests
this (there's also another test for OffscreenCanvas, but we don't ship
OffscreenCanvas yet).

Let me know if there's any concern with this.

-- Emilio