[whatwg] Canvas in workers

[Robert O'Callahan]

We talked through this proposal with a lot of Mozilla people in a meeting
and collectively decided that we don't care about the case of workers that
commit multiple frames to a canvas without yielding --- at least for now.
So we want to remove commit() and copy the main-thread semantics that a
canvas frame is eligible for presentation whenever script is not running in
the worker.

Rob
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