Land Recent QUIC changes.

net/quic/quic_sent_packet_manager.cc

Index: net/quic/quic_sent_packet_manager.cc
diff --git a/net/quic/quic_sent_packet_manager.cc b/net/quic/quic_sent_packet_manager.cc
index b31899b8a57587c1ebe6d27623d9d1a7e3785087..a9f26b88d74debc77ece3e5a75d5cd3ea8534626 100644
--- a/net/quic/quic_sent_packet_manager.cc
+++ b/net/quic/quic_sent_packet_manager.cc
@@ -6,6 +6,7 @@
 
 #include "base/logging.h"
 #include "base/stl_util.h"
+#include "net/quic/quic_ack_notifier_manager.h"
 
 using std::make_pair;
 
@@ -58,6 +59,8 @@ void QuicSentPacketManager::OnSerializedPacket(
     return;
   }
 
+  ack_notifier_manager_.OnSerializedPacket(serialized_packet);
+
   DCHECK(unacked_packets_.empty() ||
          unacked_packets_.rbegin()->first <
          serialized_packet.sequence_number);
@@ -88,6 +91,12 @@ void QuicSentPacketManager::OnRetransmittedPacket(
 
   RetransmittableFrames* frames = unacked_packets_[old_sequence_number];
   DCHECK(frames);
+
+  // A notifier may be waiting to hear about ACKs for the original sequence
+  // number. Inform them that the sequence number has changed.
+  ack_notifier_manager_.UpdateSequenceNumber(old_sequence_number,
+                                             new_sequence_number);
+
   if (FLAGS_track_retransmission_history) {
     // We keep the old packet in the unacked packet list until it, or one of
     // the retransmissions of it are acked.
@@ -126,6 +135,11 @@ void QuicSentPacketManager::OnIncomingAck(
     SequenceNumberSet* acked_packets) {
   HandleAckForSentPackets(received_info, is_truncated_ack, acked_packets);
   HandleAckForSentFecPackets(received_info, acked_packets);
+
+  if (acked_packets->size() > 0) {
+    // The AckNotifierManager should be informed of every ACKed sequence number.
+    ack_notifier_manager_.OnIncomingAck(*acked_packets);
+  }
 }
 
 void QuicSentPacketManager::DiscardUnackedPacket(