Allow the number of connections QUIC's send algorithms simulate to

net/quic/congestion_control/send_algorithm_interface.h

Index: net/quic/congestion_control/send_algorithm_interface.h
diff --git a/net/quic/congestion_control/send_algorithm_interface.h b/net/quic/congestion_control/send_algorithm_interface.h
index 24d965d0d54fc3f315f977b9e4723077b693cec7..14383f86f7e10258401bb0246dbcc82424294fdd 100644
--- a/net/quic/congestion_control/send_algorithm_interface.h
+++ b/net/quic/congestion_control/send_algorithm_interface.h
@@ -38,6 +38,10 @@ class NET_EXPORT_PRIVATE SendAlgorithmInterface {
 
   virtual void SetFromConfig(const QuicConfig& config, bool is_server) = 0;
 
+  // Sets the number of connections to emulate when doing congestion control,
+  // particularly for congestion avoidance.  Can be set any time.
+  virtual void SetNumEmulatedConnections(int num_connections) = 0;
+
   // Called when we receive congestion feedback from remote peer.
   virtual void OnIncomingQuicCongestionFeedbackFrame(
       const QuicCongestionFeedbackFrame& feedback,