Create QUIC_VERSION_16 which breaks the sent_info field out of the ACK

net/quic/quic_packet_creator.cc

 // Copyright (c) 2012 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.
 
 #include "net/quic/quic_packet_creator.h"
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "net/quic/crypto/quic_random.h"
 #include "net/quic/quic_ack_notifier.h"
@@ skipping 388 matching lines @@
   header->public_header.version_flag = send_version_in_packet_;
   header->fec_flag = fec_flag;
   header->packet_sequence_number = ++sequence_number_;
   header->public_header.sequence_number_length = sequence_number_length_;
   header->entropy_flag = random_bool_source_->RandBool();
   header->is_in_fec_group = fec_group == 0 ? NOT_IN_FEC_GROUP : IN_FEC_GROUP;
   header->fec_group = fec_group;
 }
 
 bool QuicPacketCreator::ShouldRetransmit(const QuicFrame& frame) {
-  return frame.type != ACK_FRAME && frame.type != CONGESTION_FEEDBACK_FRAME &&
-      frame.type != PADDING_FRAME;
+  switch (frame.type) {
+    case ACK_FRAME:
+    case CONGESTION_FEEDBACK_FRAME:
+    case PADDING_FRAME:
+    case STOP_WAITING_FRAME:
+      return false;
+    default:
+      return true;
+  }
 }
 
 bool QuicPacketCreator::AddFrame(const QuicFrame& frame,
                                  bool save_retransmittable_frames) {
   DVLOG(1) << "Adding frame: " << frame;
   size_t frame_len = framer_->GetSerializedFrameLength(
       frame, BytesFree(), queued_frames_.empty(), true,
       options()->send_sequence_number_length);
   if (frame_len == 0) {
     return false;
@@ skipping 42 matching lines @@
   if (!is_handshake) {
     return;
   }
 
   QuicPaddingFrame padding;
   bool success = AddFrame(QuicFrame(&padding), false);
   DCHECK(success);
 }
 
 }  // namespace net