In order to configure what background users will see, add runtime flag to
- always show existing background (default),
- block until assets component is ready and show asset background or
- show existing background if assets component unavailable, asset background otherwise.
 

In order to configure what background users will see in VR Browsing Mode, add runtime flag to
- always show existing background (default),
- block until assets component is ready and show asset background or
- show existing background if assets component unavailable, asset background otherwise.
 

In order to configure what background users will see in VR Browsing Mode, add runtime flag to
- (default) show existing background if assets component unavailable, asset background otherwise, or
- block until assets component is ready and show asset background.