org.scalajs.dom.experimental.mediastream
see https://www.w3.org/TR/2016/CR-mediacapture-streams-20160519/#idl-def-MediaDeviceKind in W3C spec
see https://www.w3.org/TR/2016/CR-mediacapture-streams-20160519/#idl-def-MediaDeviceKind in W3C spec