Re: [w3c/uievents] Expose ticks in wheel events (#17)

There's a good [discussion](https://discourse.wicg.io/t/additional-use-cases-for-inputdevicecapabilities/1138/9?u=rickbyers) of the need for this on WICG, based around [this use case](https://github.com/Leaflet/Leaflet/issues/4538).

Key question is: how should this API behave on continuous scrolling devices, and can we identify those devices reliably on all OSes?  On Windows I think we'd just want `ticks` to accumulate for every `WHEEL_DELTA` amount of accumulated delta (see [MSDN](https://msdn.microsoft.com/en-us/library/windows/desktop/ms645617(v=vs.85).aspx)).  But [our experience](https://bugs.chromium.org/p/chromium/issues/detail?id=545234) suggests we may not be able to provide an API (like MacOS's [hasPreciseScrollingDeltas](https://developer.apple.com/library/mac/documentation/Cocoa/Reference/ApplicationKit/Classes/NSEvent_Class/#//apple_ref/occ/instp/NSEvent/hasPreciseScrollingDeltas)) which reliably identifies the type of scrolling device on Windows.

/cc @dtapuska @ymalik @teddink

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