Currently, the secondary UI WebContents (and process) is destroyed every time the user exits VR to avoid regressing 2D performance.

To improve the experience for users that accidentally exit VR or do something in 2D then quickly re-enter VR, we should consider not tearing down for some grace period. This should speed up the process of re-entering VR without burdening users that have not entered VR (beyond potential improvements tracked in  issue 705747 ).