Add OnConnectionMigration method to QuicSentPacketManager. Add OnConnectionMigration interface to S…

net/quic/congestion_control/rtt_stats.h

Index: net/quic/congestion_control/rtt_stats.h
diff --git a/net/quic/congestion_control/rtt_stats.h b/net/quic/congestion_control/rtt_stats.h
index a14cfcb3e26eedb18031b55594dad92036576638..df1df773cee8b2d361742b7ad00f3a02638a87d5 100644
--- a/net/quic/congestion_control/rtt_stats.h
+++ b/net/quic/congestion_control/rtt_stats.h
@@ -38,6 +38,9 @@ class NET_EXPORT_PRIVATE RttStats {
   // |num_samples| UpdateRtt calls.
   void SampleNewRecentMinRtt(uint32 num_samples);
 
+  // Called when connection migrates and rtt measurement needs to be reset.
+  void OnConnectionMigration() {}
+
   // Returns the EWMA smoothed RTT for the connection.
   // May return Zero if no valid updates have occurred.
   QuicTime::Delta smoothed_rtt() const {