Don't copy the QuicAckFrame into the QuicPacketGenerator. Protected by quic_dont_copy_acks.

net/quic/test_tools/quic_connection_peer.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/test_tools/quic_connection_peer.h"
 
 #include "base/stl_util.h"
 #include "net/quic/congestion_control/send_algorithm_interface.h"
 #include "net/quic/quic_packet_writer.h"
 #include "net/quic/quic_received_packet_manager.h"
@@ skipping 16 matching lines @@
   connection->sent_packet_manager_.send_algorithm_.reset(send_algorithm);
 }
 
 // static
 void QuicConnectionPeer::PopulateAckFrame(QuicConnection* connection,
                                           QuicAckFrame* ack) {
   connection->PopulateAckFrame(ack);
 }
 
 // static
+const QuicFrame QuicConnectionPeer::GetUpdatedAckFrame(
+    QuicConnection* connection) {
+  return connection->GetUpdatedAckFrame();
+}
+
+// static
 void QuicConnectionPeer::PopulateStopWaitingFrame(
     QuicConnection* connection,
     QuicStopWaitingFrame* stop_waiting) {
   connection->PopulateStopWaitingFrame(stop_waiting);
 }
 
 // static
 QuicConnectionVisitorInterface* QuicConnectionPeer::GetVisitor(
     QuicConnection* connection) {
   return connection->visitor_;
@@ skipping 208 matching lines @@
 }
 
 // static
 void QuicConnectionPeer::SetAckMode(QuicConnection* connection,
                                     QuicConnection::AckMode ack_mode) {
   connection->ack_mode_ = ack_mode;
 }
 
 }  // namespace test
 }  // namespace net