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

net/quic/quic_headers_stream.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_QUIC_QUIC_HEADERS_STREAM_H_
 #define NET_QUIC_QUIC_HEADERS_STREAM_H_
 
 #include <stddef.h>
 
 #include "base/macros.h"
@@ skipping 31 matching lines @@
   virtual size_t WritePushPromise(QuicStreamId original_stream_id,
                                   QuicStreamId promised_stream_id,
                                   const SpdyHeaderBlock& headers,
                                   QuicAckListenerInterface* ack_listener);
 
   // ReliableQuicStream implementation
   void OnDataAvailable() override;
 
   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;
 
   // The following methods are called by the SimpleVisitor.
 
   // Called when a HEADERS frame has been received.
   void OnHeaders(SpdyStreamId stream_id,
                  bool has_priority,
                  SpdyPriority priority,
                  bool fin);
@@ skipping 42 matching lines @@
 
   SpdyFramer spdy_framer_;
   scoped_ptr<SpdyFramerVisitor> spdy_framer_visitor_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicHeadersStream);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_HEADERS_STREAM_H_