Revert of Remove obsolete QUIC disabling code.

components/network_session_configurator/network_session_configurator.cc

Index: components/network_session_configurator/network_session_configurator.cc
diff --git a/components/network_session_configurator/network_session_configurator.cc b/components/network_session_configurator/network_session_configurator.cc
index 593da58040cf3857f2a3b10b80469890dbee58d3..e8d894a4358c11da1523dc3bdfca96c9ed301d99 100644
--- a/components/network_session_configurator/network_session_configurator.cc
+++ b/components/network_session_configurator/network_session_configurator.cc
@@ -152,6 +152,27 @@
       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;
@@ -316,6 +337,15 @@
         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 =