Early connection migration in QUIC.

net/quic/quic_session.cc

Index: net/quic/quic_session.cc
diff --git a/net/quic/quic_session.cc b/net/quic/quic_session.cc
index c57dc1ed35f047153eb6880726c21ae2d8dea703..f73e842a2c8493f089534f12f47fa376b6c89cf0 100644
--- a/net/quic/quic_session.cc
+++ b/net/quic/quic_session.cc
@@ -87,6 +87,8 @@ class VisitorShim : public QuicConnectionVisitorInterface {
 
   void OnConnectionMigration() override { session_->OnConnectionMigration(); }
 
+  void MaybeMigrateConnection() override { session_->MaybeMigrateConnection(); }
+
   bool WillingAndAbleToWrite() const override {
     return session_->WillingAndAbleToWrite();
   }
@@ -205,6 +207,8 @@ void QuicSession::OnConnectionClosed(QuicErrorCode error, bool from_peer) {
 void QuicSession::OnSuccessfulVersionNegotiation(
     const QuicVersion& /*version*/) {}
 
+void QuicSession::MaybeMigrateConnection() {}
+
 void QuicSession::OnWindowUpdateFrame(const QuicWindowUpdateFrame& frame) {
   // Stream may be closed by the time we receive a WINDOW_UPDATE, so we can't
   // assume that it still exists.