This CL changes EncodeUsageResource and QualityScalerResource from
private inner classes of OveruseFrameDetectorResourceAdaptationModule to
standalone classes, moving them into separate files.
This CL does not intend to change any lines of code, only move them.
Except for removing an unused method quality_scaler().
Bug: webrtc:11222
Change-Id: I86bf7eb78c80031888c403ac43c2bdf9b24eaea6
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/168198
Reviewed-by: Evan Shrubsole <eshr@google.com>
Reviewed-by: Erik Språng <sprang@webrtc.org>
Commit-Queue: Henrik Boström <hbos@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#30472}
