Add xreye (#5189)
Add xreye (#5189)

Add XREye type
Adds the XREye enumerated type to BCD.

Source:
* https://immersive-web.github.io/webxr/#enumdef-xreye

* XREye is in Chrome 79, according to Joe.
chrisdavidmills/browser-compat-data,mdn/browser-compat-data,chrisdavidmills/browser-compat-data,mdn/browser-compat-data