Revert of Remove obsolete QUIC disabling code.

net/http/http_network_session.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_HTTP_HTTP_NETWORK_SESSION_H_
 #define NET_HTTP_HTTP_NETWORK_SESSION_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 107 matching lines @@
     float quic_load_server_info_timeout_srtt_multiplier;
     // Causes QUIC to race reading the server config from disk with
     // sending an inchoate CHLO.
     bool quic_enable_connection_racing;
     // Use non-blocking IO for UDP sockets.
     bool quic_enable_non_blocking_io;
     // Disables using the disk cache to store QUIC server configs.
     bool quic_disable_disk_cache;
     // Prefer AES-GCM to ChaCha20 even if no hardware support is present.
     bool quic_prefer_aes;
+    // Specifies the maximum number of connections with high packet loss in
+    // a row after which QUIC will be disabled.
+    int quic_max_number_of_lossy_connections;
+    // Specifies packet loss rate in fraction after which a connection is
+    // closed and is considered as a lossy connection.
+    float quic_packet_loss_threshold;
     // Size in bytes of the QUIC DUP socket receive buffer.
     int quic_socket_receive_buffer_size;
     // Delay starting a TCP connection when QUIC believes it can speak
     // 0-RTT to a server.
     bool quic_delay_tcp_race;
     // Maximum number of server configs that are to be stored in
     // HttpServerProperties, instead of the disk cache.
     size_t quic_max_server_configs_stored_in_properties;
     // If not empty, QUIC will be used for all connections to the set of
     // origins in |origins_to_force_quic_on|.
     std::set<HostPortPair> origins_to_force_quic_on;
     // Source of time for QUIC connections. Will be owned by QuicStreamFactory.
     QuicClock* quic_clock;
     // Source of entropy for QUIC connections.
     QuicRandom* quic_random;
     // Limit on the size of QUIC packets.
     size_t quic_max_packet_length;
     // User agent description to send in the QUIC handshake.
     std::string quic_user_agent_id;
     bool enable_user_alternate_protocol_ports;
     // Optional factory to use for creating QuicCryptoClientStreams.
     QuicCryptoClientStreamFactory* quic_crypto_client_stream_factory;
     // Versions of QUIC which may be used.
     QuicVersionVector quic_supported_versions;
+    int quic_max_recent_disabled_reasons;
+    int quic_threshold_public_resets_post_handshake;
+    int quic_threshold_timeouts_streams_open;
     // Set of QUIC tags to send in the handshake's connection options.
     QuicTagVector quic_connection_options;
     // If true, all QUIC sessions are closed when any local IP address changes.
     bool quic_close_sessions_on_ip_change;
     // Specifies QUIC idle connection state lifetime.
     int quic_idle_connection_timeout_seconds;
     // Specifies the reduced ping timeout subsequent connections should use when
     // a connection was timed out with open streams.
     int quic_reduced_ping_timeout_seconds;
     // Specifies the maximum time duration that QUIC packet reader can perform
@@ skipping 143 matching lines @@
   bool enabled_protocols_[NUM_VALID_ALTERNATE_PROTOCOLS];
 
   Params params_;
 
   std::unique_ptr<base::MemoryPressureListener> memory_pressure_listener_;
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_NETWORK_SESSION_H_