Introduce Control streams for HTTP/3.

gfe-relnote: n/a --unused code.
PiperOrigin-RevId: 242161401
Change-Id: I29928112a479348ef66636b442ea6065bd832194
diff --git a/quic/core/http/quic_spdy_session.h b/quic/core/http/quic_spdy_session.h
index c968284..0ff1150 100644
--- a/quic/core/http/quic_spdy_session.h
+++ b/quic/core/http/quic_spdy_session.h
@@ -158,6 +158,10 @@
     max_inbound_header_list_size_ = max_inbound_header_list_size;
   }
 
+  size_t max_inbound_header_list_size() const {
+    return max_inbound_header_list_size_;
+  }
+
   // Returns true if the session has active request streams.
   bool HasActiveRequestStreams() const;