[WebXR] Hold a foreground assertion for the duration of the immersive session
Created attachment 439670 [details] Patch
Comment on attachment 439670 [details] Patch r=me
Committed r283297 (242322@main): <https://commits.webkit.org/242322@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 439670 [details].
<rdar://problem/83702713>