Re: [img-conversion] Blink new features (#20)

This is addressed in section 5.3 of the spec, "Canvas-in-workers".

HTMLImageElement and Blob are not transferrable to workers, so it would require costly conversion on the main thread anyway just to send them to the worker, defeating the point of trying to move the work off the main thread. It also could have higher memory requirements since there is still an image-sized canvas involved, and Mozilla were particularly concerned about reducing the memory overhead.

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https://github.com/WICG/img-conversion/issues/20#issuecomment-159911586