when volume emulation is used or when neither an input volume controller nor volume emulation are used. This CL adds 3 tests, 2 of which currently fail because APM behaves in an undesired way. In [1] the behavior is fixed and the tests are enabled. A DCHECK in `AudioProcessingImpl::set_stream_analog_level` has been removed since a more robust behavior can be obtained - namely, that expected in the disabled unit tests added in this CL. [1] https://webrtc-review.googlesource.com/c/src/+/281185 Bug: webrtc:14581 Change-Id: I29d2c000cd1baf90606487afd9a4042e6f487834 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/281184 Reviewed-by: Per Åhgren <peah@webrtc.org> Commit-Queue: Alessio Bazzica <alessiob@webrtc.org> Cr-Commit-Position: refs/heads/main@{#38696}