Re: [w3c/webcomponents] Events whose composed flag should be true (#513)

> I prefer not changing the default value, per Event interface.
> Rather, I would like to think as if UA set it to true explicitly, like the following:
>
> ```
> // This is *imaginary* code, which is happening in browser's engine for UA events.
> let e = new FocusEvent('xxx', { composed: true });
> ```
>
> Thus, I would like users to specify it explicitly as UA *does*.
>

The thing is, `FocusEvent` doesn't take `EventInit`. It takes `FocusEventInit`, which inherits from `UIEventInit`, which in turn inherits from `EventInit`.  In the case of `MouseEvent` and its derived classes, `MouseEventInit` doesn't even inherit from `EventInit` (this is presumably a spec bug though).

If we're not going to the route of initializing based on the interface, then we absolutely need to enumerate every single event for which `composed` flag must be set to `true` by UA instead of vaguely relying on the interface being used.

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