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

net/quic/quic_headers_stream.h

Index: net/quic/quic_headers_stream.h
diff --git a/net/quic/quic_headers_stream.h b/net/quic/quic_headers_stream.h
index 282a9ea5bace7f0880f653ddf5cdd7e8c57164e8..8efe13a7fa9bdc4c3caa3cabc703088f90c8eee7 100644
--- a/net/quic/quic_headers_stream.h
+++ b/net/quic/quic_headers_stream.h
@@ -49,6 +49,11 @@ class NET_EXPORT_PRIVATE QuicHeadersStream : public ReliableQuicStream {
 
   bool supports_push_promise() { return supports_push_promise_; }
 
+  // Experimental: force HPACK to use static table and huffman coding
+  // only.  Part of exploring improvements related to headers stream
+  // induced HOL blocking in QUIC.
+  void DisableHpackDynamicTable();
+
  private:
   class SpdyFramerVisitor;