Adding transmission times for every QUIC packet received in the AckFrame.

net/quic/quic_protocol.h

Index: net/quic/quic_protocol.h
diff --git a/net/quic/quic_protocol.h b/net/quic/quic_protocol.h
index a24e5e9826f59fa648aea3af1dc4d8e08d330da6..9a8fd22d3c0b5279b3ae4dd2c540d14316a87137 100644
--- a/net/quic/quic_protocol.h
+++ b/net/quic/quic_protocol.h
@@ -6,6 +6,7 @@
 #define NET_QUIC_QUIC_PROTOCOL_H_
 
 #include <limits>
+#include <map>
 #include <ostream>
 #include <utility>
 #include <vector>
@@ -168,14 +169,16 @@ typedef base::hash_set<QuicPacketSequenceNumber> SequenceSet;
 struct NET_EXPORT_PRIVATE ReceivedPacketInfo {
   ReceivedPacketInfo();
   ~ReceivedPacketInfo();
+
+  void RecordAck(QuicPacketSequenceNumber sequence_number, QuicTime time);
+  bool ContainsAck(QuicPacketSequenceNumber sequence_number) const;
+  void ClearAcksBefore(QuicPacketSequenceNumber least_unacked);
+
   // The highest packet sequence number we've received from the peer.
   QuicPacketSequenceNumber largest_received;
-  // The time at which we received the above packet.
-  QuicTime time_received;
-  // The set of packets which we're expecting and have not received.
-  // This includes any packets between the lowest and largest_received
-  // which we have neither seen nor been informed are non-retransmitting.
-  SequenceSet missing_packets;
+
+  // The set of all received packets and their arrival times.
+  std::map<QuicPacketSequenceNumber, QuicTime> received_packet_times;
 };
 
 struct NET_EXPORT_PRIVATE SentPacketInfo {
@@ -183,9 +186,6 @@ struct NET_EXPORT_PRIVATE SentPacketInfo {
   ~SentPacketInfo();
   // The lowest packet we've sent which is unacked, and we expect an ack for.
   QuicPacketSequenceNumber least_unacked;
-  // The set of packets between least_unacked and the last packet we have sent
-  // which we will not resend.
-  SequenceSet non_retransmiting;
 };
 
 // Defines for all types of congestion feedback that will be negotiated in QUIC,
@@ -241,14 +241,11 @@ struct NET_EXPORT_PRIVATE CongestionInfo {
 
 struct NET_EXPORT_PRIVATE QuicAckFrame {
   QuicAckFrame() {}
+  // Testing convenience method to construct a QuicAckFrame with all packets
+  // from least_unacked to largest_received acked at time_received.
   QuicAckFrame(QuicPacketSequenceNumber largest_received,
                QuicTime time_received,
-               QuicPacketSequenceNumber least_unacked) {
-    received_info.largest_received = largest_received;
-    received_info.time_received = time_received;
-    sent_info.least_unacked = least_unacked;
-    congestion_info.type = kNone;
-  }
+               QuicPacketSequenceNumber least_unacked);
 
   NET_EXPORT_PRIVATE friend std::ostream& operator<<(std::ostream& os,
                                                      const QuicAckFrame& s);