Re: [whatwg/dom] Simple EventListenerOptions feature detection (#491)

You really think that this is reasonable?

```JS
    let passiveSupported = false;
    const options = Object.defineProperty({}, 'passive', {
      get: function() {
        passiveSupported = true;
      },
    });
    self.addEventListener('test-passive', null, options);
```

I'm not asking for a new way of doing feature detection. Just making `EventTarget.EventListenerOptions` available would solve half the problem.

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