Add loss_limited_probe_scale as a scale factor which decides how much we should probe when bandwidth is loss limited. Bug: webrtc:12707 Change-Id: I194b2b40c9a7861d82b61585bcaf484ab228eedb Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/281360 Reviewed-by: Per Kjellander <perkj@webrtc.org> Commit-Queue: Diep Bui <diepbp@webrtc.org> Cr-Commit-Position: refs/heads/main@{#38636}