Re: [w3c/uievents] Needs alternative WheelEvent.deltaMode, WheelEvent.delat(X|Y|Z) (#181)

I've seen this difference between Chrome and Firefox cause real compat problems on real sites, so I support trying to fix it.  I agree that delta is so often pixel that it's safer to require that it ALWAYS be pixel.

So the proposal seems reasonable to me, though I worry we might just have the same problem with `rawDeltaMode`.  It seems to me having any property whose units vary based on another property is potentially problematic.  Why not have `linesDeltaX/Y` and `pageDeltaX/Y` values (which could be `undefined`)?  The `Z` axis almost certainly doesn't make sense for lines/pages, right?  Does the `X` axis have a sensible and useful definition for `lines`?

Anyway @NavidZ is the Chrome expert here, so this is just my $0.02 - I don't have objections either way.  

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