Adds QUIC_TOO_MANY_SESSIONS_ON_SERVER error code.

net/quic/core/quic_protocol.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.
 
 #ifndef NET_QUIC_QUIC_PROTOCOL_H_
 #define NET_QUIC_QUIC_PROTOCOL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 710 matching lines @@
   QUIC_CONNECTION_MIGRATION_NON_MIGRATABLE_STREAM = 84,
 
   // Stream frames arrived too discontiguously so that stream sequencer buffer
   // maintains too many gaps.
   QUIC_TOO_MANY_FRAME_GAPS = 93,
 
   // Sequencer buffer get into weird state where continuing read/write will lead
   // to crash.
   QUIC_STREAM_SEQUENCER_INVALID_STATE = 95,
 
+  // Connection closed because of server hits max number of sessions allowed.
+  // TODO(fayang): Add monitoring for QUIC_TOO_MANY_SESSIONS_ON_SERVER.
+  QUIC_TOO_MANY_SESSIONS_ON_SERVER = 96,
+
   // No error. Used as bound while iterating.
-  QUIC_LAST_ERROR = 96,
+  QUIC_LAST_ERROR = 97,
 };
 
 typedef std::array<char, 32> DiversificationNonce;
 
 struct NET_EXPORT_PRIVATE QuicPacketPublicHeader {
   QuicPacketPublicHeader();
   explicit QuicPacketPublicHeader(const QuicPacketPublicHeader& other);
   ~QuicPacketPublicHeader();
 
   // Universal header. All QuicPacket headers will have a connection_id and
@@ skipping 797 matching lines @@
       : iov(iov), iov_count(iov_count), total_length(total_length) {}
 
   const struct iovec* iov;
   const int iov_count;
   const size_t total_length;
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_PROTOCOL_H_