WebVR

[phoenixbf]

Since Chromium deprecation (https://webvr.info/get-chrome/) for Canary, OSGjs WebVR demos stopped working. Canary 66.0.xxx (with WebVR, gamepad extensions and OpenVR flag enabled as instructed) on OSGjs WebVR demo reports:

Uncaught TypeError: Cannot read property 'getEyeParameters' of undefined
    at Object.WebVR.createScene (WebVR.js:126)
    at Example.switchVR (main.js:57)
    at Example.toggleVR (main.js:96)
    at Example.requestFullScreenVR (main.js:104)
    at Example.<anonymous> (main.js:18)
    at HTMLDivElement.dispatch (jquery.min.js:3)
    at HTMLDivElement.r.handle (jquery.min.js:3)
WebVR.createScene @ WebVR.js:126
switchVR @ main.js:57
toggleVR @ main.js:96
requestFullScreenVR @ main.js:104
(anonymous) @ main.js:18
dispatch @ jquery.min.js:3
r.handle @ jquery.min.js:3

Firefox (v.58) fails WebVR most of the times with:
WebGL warning: drawArrays: This operation requires zeroing texture data. This is slow." (OSG.js)

The same Firefox build is working fine with Three.js WebVR demos and SketchFab WebVR viewer.