Change the number of emulated connections in QUIC's congestion control

net/quic/quic_connection.cc

Index: net/quic/quic_connection.cc
diff --git a/net/quic/quic_connection.cc b/net/quic/quic_connection.cc
index de84000b924434390365bc6ec4ac7b3402f77e32..9c9379c624376c66e6222d50c8cbc16ae25039e7 100644
--- a/net/quic/quic_connection.cc
+++ b/net/quic/quic_connection.cc
@@ -287,6 +287,10 @@ void QuicConnection::SetFromConfig(const QuicConfig& config) {
   max_undecryptable_packets_ = config.max_undecryptable_packets();
 }
 
+void QuicConnection::SetNumOpenStreams(size_t num_streams) {
+  sent_packet_manager_.SetNumOpenStreams(num_streams);
+}
+
 bool QuicConnection::SelectMutualVersion(
     const QuicVersionVector& available_versions) {
   // Try to find the highest mutual version by iterating over supported