When switching into WebVR and back, the camera is not restored

[blairmacintyre]

It would be preferable that when the user enters WebVR and then returns, the camera properties (pose, and field of view) are reset to what they were before entering VR.

I think this would have to change in the Empty reality, that gets used on the WebVR-capable browsers. But, eventually, other realities might need to do this too.