Roll Chrome into Mojo.

net/quic/quic_sent_packet_manager.h

 // 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.
 
 #ifndef NET_QUIC_QUIC_SENT_PACKET_MANAGER_H_
 #define NET_QUIC_QUIC_SENT_PACKET_MANAGER_H_
 
 #include <map>
 #include <set>
 #include <utility>
@@ skipping 51 matching lines @@
 
   // Interface which gets callbacks from the QuicSentPacketManager when
   // network-related state changes. Implementations must not mutate the
   // state of the packet manager as a result of these callbacks.
   class NET_EXPORT_PRIVATE NetworkChangeVisitor {
    public:
     virtual ~NetworkChangeVisitor() {}
 
     // Called when congestion window may have changed.
     virtual void OnCongestionWindowChange() = 0;
-    // TODO(jri): Add OnRttStatsChange() to this class as well.
+
+    // Called when RTT may have changed, including when an RTT is read from
+    // the config.
+    virtual void OnRttChange() = 0;
   };
 
   // Struct to store the pending retransmission information.
   struct PendingRetransmission {
     PendingRetransmission(QuicPacketSequenceNumber sequence_number,
                           TransmissionType transmission_type,
                           const RetransmittableFrames& retransmittable_frames,
                           QuicSequenceNumberLength sequence_number_length)
             : sequence_number(sequence_number),
               transmission_type(transmission_type),
@@ skipping 53 matching lines @@
 
   // Returns true if the unacked packet |sequence_number| has retransmittable
   // frames.  This will only return false if the packet has been acked, if a
   // previous transmission of this packet was ACK'd, or if this packet has been
   // retransmitted as with different sequence number.
   bool HasRetransmittableFrames(QuicPacketSequenceNumber sequence_number) const;
 
   // Returns true if there are pending retransmissions.
   bool HasPendingRetransmissions() const;
 
-  // Retrieves the next pending retransmission.
+  // Retrieves the next pending retransmission.  You must ensure that
+  // there are pending retransmissions prior to calling this function.
   PendingRetransmission NextPendingRetransmission();
 
   bool HasUnackedPackets() const;
 
   // Returns the smallest sequence number of a serialized packet which has not
   // been acked by the peer.
   QuicPacketSequenceNumber GetLeastUnacked() const;
 
   // Called when a congestion feedback frame is received from peer.
   virtual void OnIncomingQuicCongestionFeedbackFrame(
@@ skipping 248 matching lines @@
   // Records bandwidth from server to client in normal operation, over periods
   // of time with no loss events.
   QuicSustainedBandwidthRecorder sustained_bandwidth_recorder_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicSentPacketManager);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_SENT_PACKET_MANAGER_H_