SRP Repo: Issue #1033

ARBackgroundRenderer relies on command buffers to fill the screen with a material before opaque rendering.

This class is relied on to render background in AR apps (ARCore, ARInterface, etc)
I think it should be supported by - at least - the LWRP, so it would work out of the box on existing projects (I'm seeing this in issues on Github in their respective repos already, people want SRP support)

So I think the approach is, either have a way to let the ARBackgroundRenderer add it's command buffer to the current render pipeline, or have the LWRP support it out of the box.

Another approach is, since the ARBackgroundRenderer adds a command buffer to the camera, shouldn't the render pipelines, by default, loop through these commands and add them to the list before the submit?