Add class QuicMultipathReceivedPacketManager (not in use currently).

net/quic/quic_received_packet_manager.cc

 // 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.
 
 #include "net/quic/quic_received_packet_manager.h"
 
 #include <limits>
 #include <utility>
 
 #include "base/logging.h"
@@ skipping 279 matching lines @@
 bool QuicReceivedPacketManager::HasNewMissingPackets() const {
   return !ack_frame_.missing_packets.Empty() &&
          (ack_frame_.largest_observed - ack_frame_.missing_packets.Max()) <=
              kMaxPacketsAfterNewMissing;
 }
 
 size_t QuicReceivedPacketManager::NumTrackedPackets() const {
   return entropy_tracker_.size();
 }
 
+bool QuicReceivedPacketManager::ack_frame_updated() const {
+  return ack_frame_updated_;
+}
+
 }  // namespace net