Reduce the BWE with 50% when feedback is received too late.

webrtc/modules/remote_bitrate_estimator/aimd_rate_control.h

Index: webrtc/modules/remote_bitrate_estimator/aimd_rate_control.h
diff --git a/webrtc/modules/remote_bitrate_estimator/aimd_rate_control.h b/webrtc/modules/remote_bitrate_estimator/aimd_rate_control.h
index b3c5928e054af3ab1657ff84258214a234a45f73..f5a9707282b24376be89dcafe3cbc7e021d41105 100644
--- a/webrtc/modules/remote_bitrate_estimator/aimd_rate_control.h
+++ b/webrtc/modules/remote_bitrate_estimator/aimd_rate_control.h
@@ -61,6 +61,8 @@ class AimdRateControl {
   uint32_t ChangeBitrate(uint32_t current_bit_rate,
                          uint32_t incoming_bit_rate,
                          int64_t now_ms);
+  uint32_t ClampBitrate(uint32_t new_bitrate_bps,
+                        uint32_t incoming_bitrate_bps) const;
   uint32_t MultiplicativeRateIncrease(int64_t now_ms, int64_t last_ms,
                                       uint32_t current_bitrate_bps) const;
   uint32_t AdditiveRateIncrease(int64_t now_ms, int64_t last_ms) const;