Summary: Implementing AnimationFrameProvider will allow dedicated worker
threads to access requestAnimationFrame and cancelAnimationFrame to drive
worker based animations. This is a typical way to drive OffscreenCanvas
rendering, and as such is a dependency for that to eventually ship.

Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1738971

Standard:
https://html.spec.whatwg.org/multipage/imagebitmap-and-animations.html#animation-frames

Platform coverage: all

Preference: No preference.

Other browsers: Chrome has shipped it since 69.

web-platform-tests:
https://searchfox.org/mozilla-central/source/testing/web-platform/tests/html/dom/idlharness.worker.js
https://searchfox.org/mozilla-central/source/testing/web-platform/tests/workers/WorkerGlobalScope_requestAnimationFrame.tentative.worker.js

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