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..03fc2d3f9e54274aacc88f342e992b9068a2f508 100644
--- a/webrtc/modules/remote_bitrate_estimator/aimd_rate_control.h
+++ b/webrtc/modules/remote_bitrate_estimator/aimd_rate_control.h
@@ -58,9 +58,14 @@ class AimdRateControl {
   // in the "decrease" state the bitrate will be decreased to slightly below the
   // incoming bitrate. When in the "hold" state the bitrate will be kept
   // constant to allow built up queues to drain.
-  uint32_t ChangeBitrate(uint32_t current_bit_rate,
-                         uint32_t incoming_bit_rate,
+  uint32_t ChangeBitrate(uint32_t current_bitrate,
+                         uint32_t incoming_bitrate,
                          int64_t now_ms);
+  // Clamps new_bitrate_bps to within the configured min bitrate and a linear
+  // function of the incoming bitrate, so that the new bitrate can't grow too
+  // large compared to the bitrate actually being received by the other end.
+  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;