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When loss rate is above a certain threshold, set instant_limit = 500 - 1000 * average_loss_rate, which returns 200kbps at 30% loss rate, or 100kbps at 40% loss rate. When the loss rate is above 50%, use the min_bitrate from send_side_bandwidth_estimation. The high_loss_rate_threshold is set to 1.0, so the change is not activated by default. Tested the change with hamrit, when average loss rate is above 50%, bandwidth backed to 10kbps, and it took ~10s to ramp up to 1.5Mbps. https://screenshot.googleplex.com/7dvPoWa2b5SgMSL Bug: webrtc:12707 Change-Id: I5eea04ef709a183bdf696246094dbd4a204e48f6 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/272061 Reviewed-by: Per Kjellander <perkj@webrtc.org> Commit-Queue: Diep Bui <diepbp@webrtc.org> Cr-Commit-Position: refs/heads/main@{#38243}