When talking >=QUIC_VERSION_22, regularly send updated bandwidth

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 35617c89bc67378aa10a7567c317032a9536010e..03b9149eac154f5e4cba82fbfd2ef7023d89b9c3 100644
--- a/net/quic/quic_connection.cc
+++ b/net/quic/quic_connection.cc
@@ -251,7 +251,7 @@ QuicConnection::QuicConnection(QuicConnectionId connection_id,
   framer_.set_visitor(this);
   framer_.set_received_entropy_calculator(&received_packet_manager_);
   stats_.connection_creation_time = clock_->ApproximateNow();
-  sent_packet_manager_.set_network_change_visitor(&packet_generator_);
+  sent_packet_manager_.set_network_change_visitor(this);
 }
 
 QuicConnection::~QuicConnection() {
@@ -1542,6 +1542,11 @@ bool QuicConnection::OnSerializedPacket(
                            NOT_RETRANSMISSION);
 }
 
+void QuicConnection::OnCongestionWindowChange(QuicByteCount congestion_window) {
+  packet_generator_.OnCongestionWindowChange(congestion_window);
+  visitor_->OnCongestionWindowChange(clock_->ApproximateNow());
+}
+
 void QuicConnection::OnHandshakeComplete() {
   sent_packet_manager_.SetHandshakeConfirmed();
 }