Revert of Remove obsolete QUIC disabling code.

net/http/http_network_session.cc

 // 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.
 
 #include "net/http/http_network_session.h"
 
 #include <utility>
 
 #include "base/atomic_sequence_num.h"
 #include "base/compiler_specific.h"
@@ skipping 48 matching lines @@
 
 // The maximum receive window sizes for HTTP/2 sessions and streams.
 const int32_t kSpdySessionMaxRecvWindowSize = 15 * 1024 * 1024;  // 15 MB
 const int32_t kSpdyStreamMaxRecvWindowSize = 6 * 1024 * 1024;    //  6 MB
 // QUIC's socket receive buffer size.
 // We should adaptively set this buffer size, but for now, we'll use a size
 // that seems large enough to receive data at line rate for most connections,
 // and does not consume "too much" memory.
 const int32_t kQuicSocketReceiveBufferSize = 1024 * 1024;  // 1MB
 
+// Number of recent connections to consider for certain thresholds
+// that trigger disabling QUIC.  E.g. disable QUIC if PUBLIC_RESET was
+// received post handshake for at least 2 of 20 recent connections.
+const int32_t kQuicMaxRecentDisabledReasons = 20;
+
 HttpNetworkSession::Params::Params()
     : client_socket_factory(NULL),
       host_resolver(NULL),
       cert_verifier(NULL),
       channel_id_service(NULL),
       transport_security_state(NULL),
       cert_transparency_verifier(NULL),
       ct_policy_enforcer(NULL),
       proxy_service(NULL),
       ssl_config_service(NULL),
@@ skipping 15 matching lines @@
       enable_quic(false),
       disable_quic_on_timeout_with_open_streams(false),
       enable_quic_port_selection(true),
       quic_always_require_handshake_confirmation(false),
       quic_disable_connection_pooling(false),
       quic_load_server_info_timeout_srtt_multiplier(0.25f),
       quic_enable_connection_racing(false),
       quic_enable_non_blocking_io(false),
       quic_disable_disk_cache(false),
       quic_prefer_aes(false),
+      quic_max_number_of_lossy_connections(0),
+      quic_packet_loss_threshold(1.0f),
       quic_socket_receive_buffer_size(kQuicSocketReceiveBufferSize),
       quic_delay_tcp_race(true),
       quic_max_server_configs_stored_in_properties(0u),
       quic_clock(NULL),
       quic_random(NULL),
       quic_max_packet_length(kDefaultMaxPacketSize),
       enable_user_alternate_protocol_ports(false),
       quic_crypto_client_stream_factory(
           QuicCryptoClientStreamFactory::GetDefaultFactory()),
+      quic_max_recent_disabled_reasons(kQuicMaxRecentDisabledReasons),
+      quic_threshold_public_resets_post_handshake(0),
+      quic_threshold_timeouts_streams_open(0),
       quic_close_sessions_on_ip_change(false),
       quic_idle_connection_timeout_seconds(kIdleConnectionTimeoutSeconds),
       quic_reduced_ping_timeout_seconds(kPingTimeoutSecs),
       quic_packet_reader_yield_after_duration_milliseconds(
           kQuicYieldAfterDurationMilliseconds),
       quic_disable_preconnect_if_0rtt(false),
       quic_migrate_sessions_on_network_change(false),
       quic_migrate_sessions_early(false),
       quic_allow_server_migration(false),
       quic_disable_bidirectional_streams(false),
@@ skipping 39 matching lines @@
           params.quic_user_agent_id,
           params.quic_supported_versions,
           params.enable_quic_port_selection,
           params.quic_always_require_handshake_confirmation,
           params.quic_disable_connection_pooling,
           params.quic_load_server_info_timeout_srtt_multiplier,
           params.quic_enable_connection_racing,
           params.quic_enable_non_blocking_io,
           params.quic_disable_disk_cache,
           params.quic_prefer_aes,
+          params.quic_max_number_of_lossy_connections,
+          params.quic_packet_loss_threshold,
+          params.quic_max_recent_disabled_reasons,
+          params.quic_threshold_public_resets_post_handshake,
+          params.quic_threshold_timeouts_streams_open,
           params.quic_socket_receive_buffer_size,
           params.quic_delay_tcp_race,
           params.quic_max_server_configs_stored_in_properties,
           params.quic_close_sessions_on_ip_change,
           params.disable_quic_on_timeout_with_open_streams,
           params.quic_idle_connection_timeout_seconds,
           params.quic_reduced_ping_timeout_seconds,
           params.quic_packet_reader_yield_after_duration_milliseconds,
           params.quic_migrate_sessions_on_network_change,
           params.quic_migrate_sessions_early,
@@ skipping 132 matching lines @@
     origins_to_force_quic_on->AppendString("'" + origin.ToString() + "'");
   }
   dict->Set("origins_to_force_quic_on", std::move(origins_to_force_quic_on));
 
   dict->SetDouble("load_server_info_timeout_srtt_multiplier",
                   params_.quic_load_server_info_timeout_srtt_multiplier);
   dict->SetBoolean("enable_connection_racing",
                    params_.quic_enable_connection_racing);
   dict->SetBoolean("disable_disk_cache", params_.quic_disable_disk_cache);
   dict->SetBoolean("prefer_aes", params_.quic_prefer_aes);
+  dict->SetInteger("max_number_of_lossy_connections",
+                   params_.quic_max_number_of_lossy_connections);
+  dict->SetDouble("packet_loss_threshold", params_.quic_packet_loss_threshold);
   dict->SetBoolean("delay_tcp_race", params_.quic_delay_tcp_race);
   dict->SetInteger("max_server_configs_stored_in_properties",
                    params_.quic_max_server_configs_stored_in_properties);
   dict->SetInteger("idle_connection_timeout_seconds",
                    params_.quic_idle_connection_timeout_seconds);
   dict->SetInteger("reduced_ping_timeout_seconds",
                    params_.quic_reduced_ping_timeout_seconds);
   dict->SetInteger(
       "packet_reader_yield_after_duration_milliseconds",
       params_.quic_packet_reader_yield_after_duration_milliseconds);
   dict->SetBoolean("disable_preconnect_if_0rtt",
                    params_.quic_disable_preconnect_if_0rtt);
   dict->SetBoolean("disable_quic_on_timeout_with_open_streams",
                    params_.disable_quic_on_timeout_with_open_streams);
-  dict->SetBoolean("is_quic_disabled", quic_stream_factory_.IsQuicDisabled());
+  dict->SetString("disabled_reason",
+                  quic_stream_factory_.QuicDisabledReasonString());
   dict->SetBoolean("force_hol_blocking", params_.quic_force_hol_blocking);
   dict->SetBoolean("race_cert_verification",
                    params_.quic_race_cert_verification);
   return std::move(dict);
 }
 
 void HttpNetworkSession::CloseAllConnections() {
   normal_socket_pool_manager_->FlushSocketPoolsWithError(ERR_ABORTED);
   websocket_socket_pool_manager_->FlushSocketPoolsWithError(ERR_ABORTED);
   spdy_session_pool_.CloseCurrentSessions(ERR_ABORTED);
@@ skipping 54 matching lines @@
     case base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_NONE:
       break;
     case base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE:
     case base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_CRITICAL:
       CloseIdleConnections();
       break;
   }
 }
 
 }  // namespace net