Re: [w3c/uievents] MouseEvent.screenX/Y coordinate space id not clear (#150)

Relevant table from @EiraGe's document:

ScreenX/Y | Edge | Chrome | Firefox | Safari | ChromeMobile | Firefox Mobile | Safari Mobile
-- | -- | -- | -- | -- | -- | -- | --
coordinate space | Physical pixel | DIP | DIP | DIP | DIP | DIP |  
Scaled by device-scale-factor(OS High DPI setting) | X | ✓ | ✓ | ✓ | ✓ | ✓ | ✓?
Scaled by browser zoom | X | X | X | X | No browserzoom |   | No browserzoom
pinch-zoom-scale | X | X | No pinch zoom | X | X | ✓(scale) | ✓(origin & scale)

(where `PhysicalPixel * DeviceScaleFactor = DIP` and `DIP * BrowserZoom = CssPixel`)

With the recent announcement of Edge moving to adopt Chromium/Blink, I assume that Edge will soon be using DIPs as well.  If so, then updating the spec to specifying `screenX/Y` as DIPs seems noncontroversial.

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