Test wiring to DegradationPreference passed to VideoSendStream::SetSource, but not the adaptation implemented in the test class FakeVideoCapturer. Bug: webrtc:6353 Change-Id: Iec2ae89283fb856822ea2829db17eaa02337b467 Reviewed-on: https://webrtc-review.googlesource.com/c/117641 Reviewed-by: Erik Språng <sprang@webrtc.org> Commit-Queue: Niels Moller <nisse@webrtc.org> Cr-Commit-Position: refs/heads/master@{#26278}