When talking >=QUIC_VERSION_22, regularly send updated bandwidth

net/quic/quic_server_session.h

 // Copyright 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.
 //
 // A server specific QuicSession subclass.
 
 #ifndef NET_QUIC_QUIC_SERVER_SESSION_H_
 #define NET_QUIC_QUIC_SERVER_SESSION_H_
 
 #include <set>
@@ skipping 36 matching lines @@
   // Takes ownership of connection_packet_writer
   QuicServerSession(const QuicConfig& config,
                     QuicConnection* connection,
                     QuicPerConnectionPacketWriter* connection_packet_writer,
                     QuicServerSessionVisitor* visitor);
 
   // Override the base class to notify the owner of the connection close.
   virtual void OnConnectionClosed(QuicErrorCode error, bool from_peer) OVERRIDE;
   virtual void OnWriteBlocked() OVERRIDE;
 
+  // Sends a server config update to the client, containing new bandwidth
+  // estimate.
+  virtual void OnCongestionWindowChange(QuicTime now) OVERRIDE;
+
   virtual ~QuicServerSession();
 
   virtual void InitializeSession(const QuicCryptoServerConfig& crypto_config);
 
   const QuicCryptoServerStream* crypto_stream() const {
     return crypto_stream_.get();
   }
 
   // Override base class to process FEC config received from client.
   virtual void OnConfigNegotiated() OVERRIDE;
 
+  void set_serving_region(string serving_region) {
+    serving_region_ = serving_region;
+  }
+
  protected:
   // QuicSession methods:
   virtual QuicDataStream* CreateIncomingDataStream(QuicStreamId id) OVERRIDE;
   virtual QuicDataStream* CreateOutgoingDataStream() OVERRIDE;
   virtual QuicCryptoServerStream* GetCryptoStream() OVERRIDE;
 
   // If we should create an incoming stream, returns true. Otherwise
   // does error handling, including communicating the error to the client and
   // possibly closing the connection, and returns false.
   virtual bool ShouldCreateIncomingDataStream(QuicStreamId id);
 
   virtual QuicCryptoServerStream* CreateQuicCryptoServerStream(
       const QuicCryptoServerConfig& crypto_config);
 
  private:
   friend class test::QuicServerSessionPeer;
 
   scoped_ptr<QuicCryptoServerStream> crypto_stream_;
   scoped_ptr<QuicPerConnectionPacketWriter> connection_packet_writer_;
   QuicServerSessionVisitor* visitor_;
 
+  // The most recent bandwidth estimate sent to the client.
+  QuicBandwidth bandwidth_estimate_sent_to_client_;
+
+  // Text describing server location. Sent to the client as part of the bandwith
+  // estimate in the source-address token. Optional, can be left empty.
+  string serving_region_;
+
+  // Time at which we send the last SCUP to the client.
+  QuicTime last_server_config_update_time_;
+
   DISALLOW_COPY_AND_ASSIGN(QuicServerSession);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_SERVER_SESSION_H_