Reland: Fix race / crash in OnNetworkRouteChanged().

webrtc/modules/congestion_controller/transport_feedback_adapter.h

 /*
  *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#ifndef WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_TRANSPORT_FEEDBACK_ADAPTER_H_
-#define WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_TRANSPORT_FEEDBACK_ADAPTER_H_
+#ifndef WEBRTC_MODULES_CONGESTION_CONTROLLER_TRANSPORT_FEEDBACK_ADAPTER_H_
+#define WEBRTC_MODULES_CONGESTION_CONTROLLER_TRANSPORT_FEEDBACK_ADAPTER_H_
 
 #include <memory>
 #include <vector>
 
 #include "webrtc/base/criticalsection.h"
 #include "webrtc/base/thread_annotations.h"
+#include "webrtc/base/thread_checker.h"
+#include "webrtc/modules/congestion_controller/delay_based_bwe.h"
 #include "webrtc/modules/include/module_common_types.h"
-#include "webrtc/modules/remote_bitrate_estimator/include/remote_bitrate_estimator.h"
 #include "webrtc/modules/remote_bitrate_estimator/include/send_time_history.h"
 
 namespace webrtc {
 
+class BitrateController;
 class ProcessThread;
 
 class TransportFeedbackAdapter : public TransportFeedbackObserver,
                                  public CallStatsObserver {
  public:
-  explicit TransportFeedbackAdapter(Clock* clock);
+  TransportFeedbackAdapter(Clock* clock, BitrateController* bitrate_controller);
   virtual ~TransportFeedbackAdapter();
 
-  void SetBitrateEstimator(RemoteBitrateEstimator* rbe);
-  RemoteBitrateEstimator* GetBitrateEstimator() const {
-    return bitrate_estimator_.get();
-  }
-
+  void InitBwe();
   // Implements TransportFeedbackObserver.
   void AddPacket(uint16_t sequence_number,
                  size_t length,
                  int probe_cluster_id) override;
   void OnSentPacket(uint16_t sequence_number, int64_t send_time_ms);
 
+  // TODO(holmer): This method should return DelayBasedBwe::Result so that we
+  // can get rid of the dependency on BitrateController. Requires changes
+  // to the CongestionController interface.
   void OnTransportFeedback(const rtcp::TransportFeedback& feedback) override;
   std::vector<PacketInfo> GetTransportFeedbackVector() const override;
 
   // Implements CallStatsObserver.
   void OnRttUpdate(int64_t avg_rtt_ms, int64_t max_rtt_ms) override;
 
+  void SetMinBitrate(int min_bitrate_bps);
+
  private:
   std::vector<PacketInfo> GetPacketFeedbackVector(
       const rtcp::TransportFeedback& feedback);
 
   rtc::CriticalSection lock_;
+  rtc::CriticalSection bwe_lock_;
   SendTimeHistory send_time_history_ GUARDED_BY(&lock_);
-  std::unique_ptr<RemoteBitrateEstimator> bitrate_estimator_;
+  std::unique_ptr<DelayBasedBwe> delay_based_bwe_ GUARDED_BY(&bwe_lock_);
   Clock* const clock_;
   int64_t current_offset_ms_;
   int64_t last_timestamp_us_;
+  BitrateController* const bitrate_controller_;
   std::vector<PacketInfo> last_packet_feedback_vector_;
 };
 
 }  // namespace webrtc
 
-#endif  // WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_TRANSPORT_FEEDBACK_ADAPTER_H_
+#endif  // WEBRTC_MODULES_CONGESTION_CONTROLLER_TRANSPORT_FEEDBACK_ADAPTER_H_