Add a new QUIC Ack Decimation mode that is reordering tolerant. Protected by FLAG_quic_ack_decimati…

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 269 matching lines @@
       // Ack frame gets updated because missing packets are updated because of
       // stop waiting frame.
       ack_frame_updated_ = true;
     }
     peer_least_packet_awaiting_ack_ = stop_waiting.least_unacked;
   }
   DCHECK(ack_frame_.missing_packets.Empty() ||
          ack_frame_.missing_packets.Min() >= peer_least_packet_awaiting_ack_);
 }
 
+bool QuicReceivedPacketManager::HasMissingPackets() const {
+  return !ack_frame_.missing_packets.Empty();
+}
+
 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