Re: [whatwg/dom] Add window.event for web compatibility. (e7cdac7)

If window.event is already set, I think we need to save it somewhere so that we can recover it later after the current event listener is finished.

e.g.
``` javascript
function clickEventListener(e) {
   assert(window.event == e);
   body.dispatchEvent(anotherEvent); // Dispatch another event synchrounously
   assert(window.event == e);  <-- This would fail because window.event might be set to an undefined by another event listener.
}
```

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