Clank supports to request multiple permissions at same time, we can use https://permission.site to cover it, the valid combinations are:
- geolocation
- camera
- mic
- camera+mic
- storage

In 2D model, user can click the buttons to request multiple permissions at same time. Clank will pop up one dialog for each permission, and user need to dismiss one to see another.

We need to add similar test cases for VR browser to make sure it works well when request multiple permissions at same time.