Revert of Remove obsolete QUIC disabling code.

components/network_session_configurator/network_session_configurator.cc

 // Copyright 2016 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 "components/network_session_configurator/network_session_configurator.h"
 
 #include <map>
 
 #include "base/metrics/field_trial.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 134 matching lines @@
 bool ShouldQuicPreferAes(const VariationParameters& quic_trial_params) {
   return base::LowerCaseEqualsASCII(
       GetVariationParam(quic_trial_params, "prefer_aes"), "true");
 }
 
 bool ShouldForceHolBlocking(const VariationParameters& quic_trial_params) {
   return base::LowerCaseEqualsASCII(
       GetVariationParam(quic_trial_params, "force_hol_blocking"), "true");
 }
 
+int GetQuicMaxNumberOfLossyConnections(
+    const VariationParameters& quic_trial_params) {
+  int value;
+  if (base::StringToInt(GetVariationParam(quic_trial_params,
+                                          "max_number_of_lossy_connections"),
+                        &value)) {
+    return value;
+  }
+  return 0;
+}
+
+float GetQuicPacketLossThreshold(const VariationParameters& quic_trial_params) {
+  double value;
+  if (base::StringToDouble(
+          GetVariationParam(quic_trial_params, "packet_loss_threshold"),
+          &value)) {
+    return static_cast<float>(value);
+  }
+  return 0.0f;
+}
+
 int GetQuicSocketReceiveBufferSize(
     const VariationParameters& quic_trial_params) {
   int value;
   if (base::StringToInt(
           GetVariationParam(quic_trial_params, "receive_buffer_size"),
           &value)) {
     return value;
   }
   return 0;
 }
@@ skipping 144 matching lines @@
           load_server_info_timeout_srtt_multiplier;
     }
     params->quic_enable_connection_racing =
         ShouldQuicEnableConnectionRacing(quic_trial_params);
     params->quic_enable_non_blocking_io =
         ShouldQuicEnableNonBlockingIO(quic_trial_params);
     params->quic_disable_disk_cache =
         ShouldQuicDisableDiskCache(quic_trial_params);
     params->quic_prefer_aes = ShouldQuicPreferAes(quic_trial_params);
     params->quic_force_hol_blocking = ShouldForceHolBlocking(quic_trial_params);
+    int max_number_of_lossy_connections =
+        GetQuicMaxNumberOfLossyConnections(quic_trial_params);
+    if (max_number_of_lossy_connections != 0) {
+      params->quic_max_number_of_lossy_connections =
+          max_number_of_lossy_connections;
+    }
+    float packet_loss_threshold = GetQuicPacketLossThreshold(quic_trial_params);
+    if (packet_loss_threshold != 0)
+      params->quic_packet_loss_threshold = packet_loss_threshold;
     // Default to disabling port selection on all channels.
     params->enable_quic_port_selection = false;
     params->quic_connection_options =
         GetQuicConnectionOptions(quic_trial_params);
     params->quic_close_sessions_on_ip_change =
         ShouldQuicCloseSessionsOnIpChange(quic_trial_params);
     int idle_connection_timeout_seconds =
         GetQuicIdleConnectionTimeoutSeconds(quic_trial_params);
     if (idle_connection_timeout_seconds != 0) {
       params->quic_idle_connection_timeout_seconds =
@@ skipping 73 matching lines @@
   std::string http2_trial_group =
       base::FieldTrialList::FindFullName(kHttp2FieldTrialName);
   ConfigureHttp2Params(http2_trial_group, params);
 
   const std::string tfo_trial_group =
       base::FieldTrialList::FindFullName(kTCPFastOpenFieldTrialName);
   ConfigureTCPFastOpenParams(tfo_trial_group, params);
 }
 
 }  // namespace network_session_configurator