Re: [whatwg/dom] Consider adding Promise-based API for listerning event (#333)

@benjamingr because the code looks like:
```js
var doSomething = obj.dispatchEvent(new Event("test", {cancelable:true})
if(doSomething)
  // ...
```
So if the `preventDefault()` is not invoked during dispatch, `if(doSomething)` will go down the wrong branch.

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