relnote: Add QUIC connection option DHDT to disable HPACK dynamic table. Guarded by FLAGS

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 af92387004929c979a9a35195ea1ccd1393b2c1a..07b202abdd23d327c62fcac905df545cf598e4d0 100644
--- a/net/quic/quic_spdy_session.cc
+++ b/net/quic/quic_spdy_session.cc
@@ -113,4 +113,12 @@ void QuicSpdySession::OnPromiseHeadersComplete(QuicStreamId stream_id,
                                 ConnectionCloseBehavior::SILENT_CLOSE);
 }
 
+void QuicSpdySession::OnConfigNegotiated() {
+  QuicSession::OnConfigNegotiated();
+  if (FLAGS_quic_disable_hpack_dynamic_table &&
+      config()->HasClientSentConnectionOption(kDHDT, perspective())) {
+    headers_stream_->DisableHpackDynamicTable();
+  }
+}
+
 }  // namespace net