Not used in production. Add InRecovery() method to QUIC send algorithm

net/quic/quic_sustained_bandwidth_recorder.h

 // Copyright (c) 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_QUIC_QUIC_SUSTAINED_BANDWIDTH_RECORDER_H_
 #define NET_QUIC_QUIC_SUSTAINED_BANDWIDTH_RECORDER_H_
 
 #include "base/logging.h"
 #include "net/quic/quic_bandwidth.h"
 #include "net/quic/quic_time.h"
 
 namespace net {
 
 // This class keeps track of a sustained bandwidth estimate to ultimately send
 // to the client in a server config update message. A sustained bandwidth
 // estimate is only marked as valid if the QuicSustainedBandwidthRecorder has
 // been given uninterrupted reliable estimates over a certain period of time.
 class NET_EXPORT_PRIVATE QuicSustainedBandwidthRecorder {
  public:
   QuicSustainedBandwidthRecorder();
 
   // As long as |is_reliable_estimate| is consistently true, multiple calls to
   // this method over a 3 * srtt period results in storage of a valid sustained
   // bandwidth estimate.
   // |time_now| is used as a max bandwidth timestamp if needed.
   void RecordEstimate(bool is_reliable_estimate,
+                      bool in_slow_start,
                       QuicBandwidth bandwidth,
                       QuicTime estimate_time,
                       QuicWallTime wall_time,
                       QuicTime::Delta srtt);
 
   bool HasEstimate() const {
     return has_estimate_;
   }
 
   QuicBandwidth BandwidthEstimate() const {
     DCHECK(has_estimate_);
     return bandwidth_estimate_;
   }
 
   QuicBandwidth MaxBandwidthEstimate() const {
     DCHECK(has_estimate_);
     return max_bandwidth_estimate_;
   }
 
   int32 MaxBandwidthTimestamp() const {
     DCHECK(has_estimate_);
     return max_bandwidth_timestamp_;
   }
 
+  bool EstimateRecordedDuringSlowStart() const {
+    DCHECK(has_estimate_);
+    return bandwidth_estimate_recorded_during_slow_start_;
+  }
+
  private:
   // True if we have been able to calculate sustained bandwidth, over at least
   // one recording period (3 * rtt).
   bool has_estimate_;
 
   // True if the last call to RecordEstimate had a reliable estimate.
   bool is_recording_;
 
+  // True if the current sustained bandwidth estimate was generated while in
+  // slow start.
+  bool bandwidth_estimate_recorded_during_slow_start_;
+
   // The latest sustained bandwidth estimate.
   QuicBandwidth bandwidth_estimate_;
 
   // The maximum sustained bandwidth seen over the lifetime of the connection.
   QuicBandwidth max_bandwidth_estimate_;
 
   // Timestamp indicating when the max_bandwidth_estimate_ was seen.
   int32 max_bandwidth_timestamp_;
 
   // Timestamp marking the beginning of the latest recording period.
   QuicTime start_time_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicSustainedBandwidthRecorder);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_SUSTAINED_BANDWIDTH_RECORDER_H_