Roll Chrome into Mojo.

net/quic/quic_sent_packet_manager.h

Index: net/quic/quic_sent_packet_manager.h
diff --git a/net/quic/quic_sent_packet_manager.h b/net/quic/quic_sent_packet_manager.h
index 96891cba16b634493c726cea33ee284227d723db..287b5fc44ad30ed608224782d85b194773636c71 100644
--- a/net/quic/quic_sent_packet_manager.h
+++ b/net/quic/quic_sent_packet_manager.h
@@ -69,7 +69,10 @@ class NET_EXPORT_PRIVATE QuicSentPacketManager {
 
     // 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.
@@ -143,7 +146,8 @@ class NET_EXPORT_PRIVATE QuicSentPacketManager {
   // 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;