Update from chromium https://crrev.com/302282

net/quic/quic_connection.h

 // Copyright (c) 2012 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.
 //
 // The entity that handles framing writes for a Quic client or server.
 // Each QuicSession will have a connection associated with it.
 //
 // On the server side, the Dispatcher handles the raw reads, and hands off
 // packets via ProcessUdpPacket for framing and processing.
 //
@@ skipping 476 matching lines @@
   // will be the one last used.
   void SetAlternativeDecrypter(QuicDecrypter* decrypter,
                                EncryptionLevel level,
                                bool latch_once_used);
 
   const QuicDecrypter* decrypter() const;
   const QuicDecrypter* alternative_decrypter() const;
 
   bool is_server() const { return is_server_; }
 
+  // Allow easy overriding of truncated connection IDs.
+  void set_can_truncate_connection_ids(bool can) {
+    can_truncate_connection_ids_ = can;
+  }
+
   // Returns the underlying sent packet manager.
   const QuicSentPacketManager& sent_packet_manager() const {
     return sent_packet_manager_;
   }
 
   bool CanWrite(HasRetransmittableData retransmittable);
 
   // Stores current batch state for connection, puts the connection
   // into batch mode, and destruction restores the stored batch state.
   // While the bundler is in scope, any generated frames are bundled
@@ skipping 43 matching lines @@
   virtual void SendOrQueuePacket(QueuedPacket packet);
 
   QuicConnectionHelperInterface* helper() { return helper_; }
 
   // Selects and updates the version of the protocol being used by selecting a
   // version from |available_versions| which is also supported. Returns true if
   // such a version exists, false otherwise.
   bool SelectMutualVersion(const QuicVersionVector& available_versions);
 
   QuicPacketWriter* writer() { return writer_; }
+  const QuicPacketWriter* writer() const { return writer_; }
 
   bool peer_port_changed() const { return peer_port_changed_; }
 
   QuicPacketSequenceNumber sequence_number_of_last_sent_packet() const {
     return sequence_number_of_last_sent_packet_;
   }
 
  private:
   friend class test::QuicConnectionPeer;
   friend class test::PacketSavingConnection;
@@ skipping 19 matching lines @@
 
   // Make sure a stop waiting we got from our peer is sane.
   bool ValidateStopWaitingFrame(const QuicStopWaitingFrame& stop_waiting);
 
   // Sends a version negotiation packet to the peer.
   void SendVersionNegotiationPacket();
 
   // Clears any accumulated frames from the last received packet.
   void ClearLastFrames();
 
+  // Closes the connection if the sent or received packet manager are tracking
+  // too many outstanding packets.
+  void MaybeCloseIfTooManyOutstandingPackets();
+
   // Writes as many queued packets as possible.  The connection must not be
   // blocked when this is called.
   void WriteQueuedPackets();
 
   // Writes as many pending retransmissions as possible.
   void WritePendingRetransmissions();
 
   // Returns true if the packet should be discarded and not sent.
   bool ShouldDiscardPacket(const QueuedPacket& packet);
 
@@ skipping 195 matching lines @@
   bool peer_port_changed_;
 
   // Set to true if the UDP packet headers are addressed to a different IP.
   // We do not support connection migration when the self IP changed.
   bool self_ip_changed_;
 
   // Set to true if the UDP packet headers are addressed to a different port.
   // We do not support connection migration when the self port changed.
   bool self_port_changed_;
 
+  // Set to false if the connection should not send truncated connection IDs to
+  // the peer, even if the peer supports it.
+  bool can_truncate_connection_ids_;
+
   // If non-empty this contains the set of versions received in a
   // version negotiation packet.
   QuicVersionVector server_supported_versions_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicConnection);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_CONNECTION_H_