Re: [w3c/webcomponents] HTML Modules (#645)

Oh, maybe this would be even better if the function produced a promise for a module record. Then, your importer wouldn't have to be sync and could handle loading that resource's dependencies, if any, and would mirror [`import()`](https://github.com/tc39/proposal-dynamic-import) nicely.

This:
```js
assert(png[Symbol.importer](someArrayBuffer).default instanceof Image);
```
would instead be this
```js
png[Symbol.importer](someArrayBuffer).then(m => assert(m.default instanceof Image));
```
which feels just like this
```js
import(someUrl).then(m => /* do stuff */);
```

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