Update from https://crrev.com/312398

net/quic/quic_time_wait_list_manager.h

 // Copyright 2014 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.
 //
 // Handles packets for connection_ids in time wait state by discarding the
 // packet and sending the clients a public reset packet with exponential
 // backoff.
 
 #ifndef NET_QUIC_QUIC_TIME_WAIT_LIST_MANAGER_H_
 #define NET_QUIC_QUIC_TIME_WAIT_LIST_MANAGER_H_
@@ skipping 67 matching lines @@
 
   // Called by the dispatcher when the underlying socket becomes writable again,
   // since we might need to send pending public reset packets which we didn't
   // send because the underlying socket was write blocked.
   void OnCanWrite() override;
 
   // Used to delete connection_id entries that have outlived their time wait
   // period.
   void CleanUpOldConnectionIds();
 
+  // If necessary, trims the oldest connections from the time-wait list until
+  // the size is under the configured maximum.
+  void TrimTimeWaitListIfNeeded();
+
   // Given a ConnectionId that exists in the time wait list, returns the
   // QuicVersion associated with it.
   QuicVersion GetQuicVersionFromConnectionId(QuicConnectionId connection_id);
 
   // The number of connections on the time-wait list.
   size_t num_connections() const { return connection_id_map_.size(); }
 
  protected:
   virtual QuicEncryptedPacket* BuildPublicReset(
       const QuicPublicResetPacket& packet);
@@ skipping 20 matching lines @@
 
   // Sends the packet out. Returns true if the packet was successfully consumed.
   // If the writer got blocked and did not buffer the packet, we'll need to keep
   // the packet and retry sending. In case of all other errors we drop the
   // packet.
   bool WriteToWire(QueuedPacket* packet);
 
   // Register the alarm to wake up at appropriate time.
   void SetConnectionIdCleanUpAlarm();
 
+  // Removes the oldest connection from the time-wait list if it was added prior
+  // to "expiration_time".  To unconditionally remove the oldest connection, use
+  // a QuicTime::Delta:Infinity().  This function modifies the
+  // connection_id_map_.  If you plan to call this function in a loop, any
+  // iterators that you hold before the call to this function may be invalid
+  // afterward.  Returns true if the oldest connection was expired.  Returns
+  // false if the map is empty or the oldest connection has not expired.
+  bool MaybeExpireOldestConnection(QuicTime expiration_time);
+
   // A map from a recently closed connection_id to the number of packets
   // received after the termination of the connection bound to the
   // connection_id.
   struct ConnectionIdData {
     ConnectionIdData(int num_packets_,
                      QuicVersion version_,
                      QuicTime time_added_,
                      QuicEncryptedPacket* close_packet)
         : num_packets(num_packets_),
           version(version_),
@@ skipping 30 matching lines @@
 
   // Interface that manages blocked writers.
   QuicServerSessionVisitor* visitor_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicTimeWaitListManager);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_TIME_WAIT_LIST_MANAGER_H_