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

@TakayoshiKochi I don't think so.  While the spec is quite interesting, it merely extends the CSS `<image>` type and doesn't address security concerns that would apply to rendering arbitrary elements (for example, a `<div>` that contains an `<iframe>`) onto a canvas.  Even if it would work, it seems like it would add unnecessary complexity.

What I need is a way to allow people who are using my custom video/image elements to render them onto a canvas and apply their own filters.

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