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

net/quic/quic_received_packet_manager.cc

Index: net/quic/quic_received_packet_manager.cc
diff --git a/net/quic/quic_received_packet_manager.cc b/net/quic/quic_received_packet_manager.cc
index 984aa6fec9fe829e034c3da1605e0dd07c598ea7..f4d121bbbf2bc00a51b2a6dd8bc30e98850ec87e 100644
--- a/net/quic/quic_received_packet_manager.cc
+++ b/net/quic/quic_received_packet_manager.cc
@@ -287,6 +287,10 @@ void QuicReceivedPacketManager::UpdatePacketInformationSentByPeer(
          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()) <=