Test and fix for huge bwe drop after alr state.

webrtc/modules/congestion_controller/bitrate_estimator.h

Index: webrtc/modules/congestion_controller/bitrate_estimator.h
diff --git a/webrtc/modules/congestion_controller/acknowledge_bitrate_estimator.h b/webrtc/modules/congestion_controller/bitrate_estimator.h
similarity index 66%
rename from webrtc/modules/congestion_controller/acknowledge_bitrate_estimator.h
rename to webrtc/modules/congestion_controller/bitrate_estimator.h
index 7a9d669a1cb6a5473f99d77d30152cacc71e4955..7d562081b2e45bb55955a03e288c55598992c836 100644
--- a/webrtc/modules/congestion_controller/acknowledge_bitrate_estimator.h
+++ b/webrtc/modules/congestion_controller/bitrate_estimator.h
@@ -8,8 +8,8 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#ifndef WEBRTC_MODULES_CONGESTION_CONTROLLER_ACKNOWLEDGE_BITRATE_ESTIMATOR_H_
-#define WEBRTC_MODULES_CONGESTION_CONTROLLER_ACKNOWLEDGE_BITRATE_ESTIMATOR_H_
+#ifndef WEBRTC_MODULES_CONGESTION_CONTROLLER_BITRATE_ESTIMATOR_H_
+#define WEBRTC_MODULES_CONGESTION_CONTROLLER_BITRATE_ESTIMATOR_H_
 
 #include <vector>
 
@@ -17,25 +17,21 @@
 
 namespace webrtc {
 
-struct PacketFeedback;
-
 // Computes a bayesian estimate of the throughput given acks containing
 // the arrival time and payload size. Samples which are far from the current
 // estimate or are based on few packets are given a smaller weight, as they
 // are considered to be more likely to have been caused by, e.g., delay spikes
 // unrelated to congestion.
-class AcknowledgedBitrateEstimator {
+class BitrateEstimator {
  public:
-  AcknowledgedBitrateEstimator();
+  BitrateEstimator();
+  virtual ~BitrateEstimator();
+  virtual void Update(int64_t now_ms, int bytes);
 
-  void IncomingPacketFeedbackVector(
-      const std::vector<PacketFeedback>& packet_feedback_vector);
-  rtc::Optional<uint32_t> bitrate_bps() const;
+  virtual rtc::Optional<uint32_t> bitrate_bps() const;
 
  private:
-  void Update(int64_t now_ms, int bytes);
   float UpdateWindow(int64_t now_ms, int bytes, int rate_window_ms);
-
   int sum_;
   int64_t current_win_ms_;
   int64_t prev_time_ms_;
@@ -45,4 +41,4 @@ class AcknowledgedBitrateEstimator {
 
 }  // namespace webrtc
 
-#endif  // WEBRTC_MODULES_CONGESTION_CONTROLLER_ACKNOWLEDGE_BITRATE_ESTIMATOR_H_
+#endif  // WEBRTC_MODULES_CONGESTION_CONTROLLER_BITRATE_ESTIMATOR_H_