Re: [img-conversion] Convert to spec (#14)

>        </h2>
> +      <pre class="idl">
> +typedef (HTMLImageElement or Blob) ImageSource;
> +
> +partial interface ImageData {
> +  [NewObject] Promise&lt;Blob&gt; toBlob (optional DOMString type, optional EncoderOpts options);
> +  [NewObject] static Promise&lt;ImageData&gt; create (ImageSource source);
> +  static CanPlayTypeResult canDecodeType (DOMString mimeType);

Just to make sure: mimeType here can also include video formats, right?

I think there's a very interesting use case in exposing video IFrame decoding (and encoding, to a lesser extent) using this API, enabling a highly performant [BPG](http://bellard.org/bpg/) decoding, etc

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