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

In Blink, [`V8AbstractEventListener::InvokeEventHandler`](https://cs.chromium.org/chromium/src/third_party/WebKit/Source/bindings/core/v8/V8AbstractEventListener.cpp?q=V8AbstractEventListener::InvokeEventHandler&sq=package:chromium&l=120) does the trick.  Roughly speaking, every time that Blink dispatches an `Event`, Blink puts each `Event` on stack (note that it's possible that event handling is nested), and the latest `Event` is associated with global object's `event` attribute (internally Blink is using a V8's private property for this purpose).  This is true not only for Window but also Worker/Worklet.

In [`V8AbstractEventListener::InvokeEventHandler`](https://cs.chromium.org/chromium/src/third_party/WebKit/Source/bindings/core/v8/V8AbstractEventListener.cpp?q=V8AbstractEventListener::InvokeEventHandler&sq=package:chromium&l=120), you see `saved_event` and `V8PrivateProperty::GetGlobalEvent`.

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