The number of parameters of that function starts to grow. And it is no longer just enable WebVR state anymore. We should rename it to something more appropriate and use an enum to replace booleans. We can also consider add UMA to track all possible ways which entering webvr, e.g
1. click present while in VR
2. click present while in 2D
3. autopresent
4. though callback in ondisplayactivate (insert device into headset while on a webvr page)