Call QuicSentPacketManager's OnPacketSerialized or OnRetransmittedPacket

net/quic/quic_unacked_packet_map.cc

Index: net/quic/quic_unacked_packet_map.cc
diff --git a/net/quic/quic_unacked_packet_map.cc b/net/quic/quic_unacked_packet_map.cc
index 3bba773681cfb46f769f988a4f5912c55f72d2cb..6332706326e166d9ee4096806612fd90cf26c931 100644
--- a/net/quic/quic_unacked_packet_map.cc
+++ b/net/quic/quic_unacked_packet_map.cc
@@ -38,8 +38,13 @@ QuicUnackedPacketMap::~QuicUnackedPacketMap() {
 // sent in order and the connection tracks RetransmittableFrames for longer.
 void QuicUnackedPacketMap::AddPacket(
     const SerializedPacket& serialized_packet) {
-  DCHECK_EQ(least_unacked_ + unacked_packets_.size(),
-            serialized_packet.sequence_number);
+  DCHECK_GE(serialized_packet.sequence_number,
+            least_unacked_ + unacked_packets_.size());
+  while (least_unacked_ + unacked_packets_.size() <
+         serialized_packet.sequence_number) {
+    unacked_packets_.push_back(TransmissionInfo());
+    unacked_packets_.back().is_unackable = true;
+  }
   unacked_packets_.push_back(
       TransmissionInfo(serialized_packet.retransmittable_frames,
                        serialized_packet.sequence_number_length));
@@ -67,7 +72,11 @@ void QuicUnackedPacketMap::OnRetransmittedPacket(
     TransmissionType transmission_type) {
   DCHECK_GE(old_sequence_number, least_unacked_);
   DCHECK_LT(old_sequence_number, least_unacked_ + unacked_packets_.size());
-  DCHECK_EQ(least_unacked_ + unacked_packets_.size(), new_sequence_number);
+  DCHECK_GE(new_sequence_number, least_unacked_ + unacked_packets_.size());
+  while (least_unacked_ + unacked_packets_.size() < new_sequence_number) {
+    unacked_packets_.push_back(TransmissionInfo());
+    unacked_packets_.back().is_unackable = true;
+  }
 
   // TODO(ianswett): Discard and lose the packet lazily instead of immediately.
   TransmissionInfo* transmission_info =
@@ -225,7 +234,7 @@ void QuicUnackedPacketMap::IncreaseLargestObserved(
 bool QuicUnackedPacketMap::IsPacketUseless(
     QuicPacketSequenceNumber sequence_number,
     const TransmissionInfo& info) const {
-  return sequence_number <= largest_observed_ &&
+  return (info.is_unackable || sequence_number <= largest_observed_) &&
       !info.in_flight &&
       info.retransmittable_frames == NULL &&
       info.all_transmissions == NULL;