Re: [whatwg/dom] cancelBubble legacy property (#211)

So a few things would be worth measuring, then:
 1. How often `cancelBubble` is changed from false to true (likely common) and from true to false (hopefully rare).
 2. How often the `cancelBubble` flag actually changes which callbacks are invoked (hopefully rare).

I could add this to Blink but need to focus on Media Session for a bit right now. @RByers?

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