Re: [w3c/webcomponents] Need callback for form submit data (#187)

ok, I'll apply ```formdata``` event type name.

I just started experimental implementation with the following behavior:

- Event type name is ```formdata```
- Event interface is as the following:
```
[Exposed=Window]
interface FormDataEvent : Event {
  readonly attribute FormData formData;
};
```
- The event is dispatched at the beginning of "[construct the form data set](https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#constructing-form-data-set)" algorithm
-  it's synchronous, bubbles, is not cancelable.


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