Add a new method to QuicSpdySession

net/quic/quic_spdy_session.cc

Index: net/quic/quic_spdy_session.cc
diff --git a/net/quic/quic_spdy_session.cc b/net/quic/quic_spdy_session.cc
index b258690e74d77959401ee3d68d39e7f120b8be39..ca0e67f1b4238022280a0cdfd87d5863153f8c81 100644
--- a/net/quic/quic_spdy_session.cc
+++ b/net/quic/quic_spdy_session.cc
@@ -72,6 +72,10 @@ size_t QuicSpdySession::WriteHeaders(
                                        ack_notifier_delegate);
 }
 
+void QuicSpdySession::OnHeadersHeadOfLineBlocking(QuicTime::Delta delta) {
+  // Implemented in Chromium for stats tracking.
+}
+
 QuicSpdyStream* QuicSpdySession::GetSpdyDataStream(
     const QuicStreamId stream_id) {
   return static_cast<QuicSpdyStream*>(GetOrCreateDynamicStream(stream_id));