Support Windows Mixed Reality HMDs

[chrislatorres]

The Windows Mixed Reality HMDs for VR and AR (Hololens and Hololens 2) are a fair sized segment of the XR ecosystem. Unlike the other planned XR targets (Google VR, ARCore, ARKit), there has not been an initiative started for WMR support.

For the move to DirectX it has been brought up that angle can be used, although it is not a preferred dependency.

[arpu]

this would be really cool! chrome master has now native WMR support default on ( webVr and webXr)