Add a QUIC tag to connection options to allow negotiating 1 connection

net/quic/test_tools/quic_sent_packet_manager_peer.cc

Index: net/quic/test_tools/quic_sent_packet_manager_peer.cc
diff --git a/net/quic/test_tools/quic_sent_packet_manager_peer.cc b/net/quic/test_tools/quic_sent_packet_manager_peer.cc
index 80928524847ed5bc444199a44c94789d19db0378..94e607f97855fef3c0ab66dc5f857490fa33993a 100644
--- a/net/quic/test_tools/quic_sent_packet_manager_peer.cc
+++ b/net/quic/test_tools/quic_sent_packet_manager_peer.cc
@@ -27,6 +27,13 @@ void QuicSentPacketManagerPeer::SetSendAlgorithm(
 }
 
 // static
+void QuicSentPacketManagerPeer::SetIsServer(
+    QuicSentPacketManager* sent_packet_manager,
+    bool is_server) {
+  sent_packet_manager->is_server_ = is_server;
+}
+
+// static
 const LossDetectionInterface* QuicSentPacketManagerPeer::GetLossAlgorithm(
     QuicSentPacketManager* sent_packet_manager) {
   return sent_packet_manager->loss_algorithm_.get();