Re: [heycam/webidl] Represent objects with both specified and unspecified members (#568)

Adding [WebCrypto case](https://w3c.github.io/webcrypto/#cryptokey-interface) which also uses `object` for a union of dictionaries:

```webidl
[SecureContext,Exposed=(Window,Worker)]
interface CryptoKey {
  readonly attribute KeyType type;
  readonly attribute boolean extractable;
  readonly attribute object algorithm; // union of subdictionaries of KeyAlgorithm
  readonly attribute object usages; // just returns a sequence.
};
```

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