Re: [webcomponents] Exposing a CanvasImageSource hidden by a Shadow Tree (#388)

So it sound like what you want is some kind of protocol for `drawImage()` to support. So you can pass in arbitrary objects and `drawImage()` will poke at something which returns something `drawImage()` understands. That might be better filed at https://github.com/whatwg/html/issues/new though I suppose we could keep a tracking issue here.

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