Re: [webcomponents] Permit retrieval of registered classes from window.customElements (#445)

In case every standard elements gets its own constructor as discussed in https://github.com/whatwg/html/issues/896, wouldn't it make more sense to have a registry that includes both standard and custom elements? Sample use cases:

```js
const SUPPORTS_PICTURE = document.elements.has("picture");
const SUPPORTS_SMIL = document.elements.has("animation");
const SUPPORTS_MATHML = document.elements.has("mathml");
const SUPPORTS_MESH_GRADIENTS = document.elements.has("mesh");
```

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