Re: [manifest] Manifest "sizes" fallback logic (#409)

In Gecko, I'm just going to try to use `HTMLPictureElement` to do the selection (not sure if it will work, but going to try). That is, I just convert the JSON into a bunch of `<source>` elements and let the `<picture>` element tell me what the right thing is. 

So, it might be nice to generalize the image selection algorithm to take a display context, and a bunch of sources, and let the algorithm pick one. 

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