[cssom-view] Add CanIUse panels

[cvrebert]

Bikeshed has a feature to include CanIUse info panels in specs.

I'm wondering if CSSOM View would like to use this feature? Here are the spec anchors and corresponding CanIUse features for CSSOM View:

Spec URL	CanIUse URL
https://drafts.csswg.org/cssom-view/#dom-document-elementfrompoint	http://caniuse.com/#feat=element-from-point
https://drafts.csswg.org/cssom-view/#dom-element-getboundingclientrect	http://caniuse.com/#feat=getboundingclientrect
https://drafts.csswg.org/cssom-view/#dom-element-scrollintoview	http://caniuse.com/#feat=scrollintoview
https://drafts.csswg.org/cssom-view/#dom-window-devicepixelratio	http://caniuse.com/#feat=devicepixelratio
https://drafts.csswg.org/cssom-view/#dom-window-matchmedia	http://caniuse.com/#feat=matchmedia
https://drafts.csswg.org/cssom-view/#propdef-scroll-behavior	http://caniuse.com/#feat=css-scroll-behavior

[zcorpan]

Thanks, added all but css-scroll-behavior in 9158148, blocked on speced/bikeshed#974

[cvrebert]

Thank you!