Re: [whatwg/dom] Standardize certain Microsoft event extensions (#334)

@peria, @yuki3, thank you!

I chatted with @yuki3 offline. From a spec perspective, here is the summary, as far as I understand:
- Blink sets `window.event` to an `Event` just before calling a registered event listener.
- Blink sets `window.event` to `undefined` after an event listener finishes.
- Since users can dispatch an event synchronously in an event listener, Blink uses *stack* so that this works in *reentrant* way.

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