This CL is part of the Call-Level Adaptation Processing design doc: https://docs.google.com/document/d/1ZyC26yOCknrrcYa839ZWLxD6o6Gig5A3lVTh4E41074/edit?usp=sharing The ResourceListenerResponse was used to make the QualityScaler not clear QP samples and instead increase its frequency of checking for QP under certain circumstances, see enum description: https://webrtc.googlesource.com/src.git/+/c70b1028d47c1aee4892545190cd66e97d09cd55/call/adaptation/resource.h#33 Because the QualityScaler depends on whether and how adaptation happened it should listen to adaptation happening. This CL moves the logic that was previously in VideoStreamAdapter closer to the QualityScaler: QualityScalerResource::OnAdaptationApplied(). This would allow the VideoStreamAdapter to operate on a separate task queue in the future, with no dependencies on any stream-specific resources that might operate on other task queues. Bug: webrtc:11172, webrtc:11521 Change-Id: I07971a8a5fab5715f4ccb7d2c63f1b92bd47170f Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/173090 Commit-Queue: Henrik Boström <hbos@webrtc.org> Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org> Reviewed-by: Evan Shrubsole <eshr@google.com> Cr-Commit-Position: refs/heads/master@{#31143}