QUIC: Add packet_reader_yield_after_duration_milliseconds field trial param.

net/http/http_network_session.cc

Index: net/http/http_network_session.cc
diff --git a/net/http/http_network_session.cc b/net/http/http_network_session.cc
index c7dfa475f78aff4995e15f63f5f47b0c3b28e4aa..5a36ab09483903c030b1b16361c3c6559529bc11 100644
--- a/net/http/http_network_session.cc
+++ b/net/http/http_network_session.cc
@@ -122,6 +122,8 @@ HttpNetworkSession::Params::Params()
       quic_threshold_timeouts_streams_open(0),
       quic_close_sessions_on_ip_change(false),
       quic_idle_connection_timeout_seconds(kIdleConnectionTimeoutSeconds),
+      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),
@@ -185,6 +187,7 @@ HttpNetworkSession::HttpNetworkSession(const Params& params)
           params.quic_close_sessions_on_ip_change,
           params.disable_quic_on_timeout_with_open_streams,
           params.quic_idle_connection_timeout_seconds,
+          params.quic_packet_reader_yield_after_duration_milliseconds,
           params.quic_migrate_sessions_on_network_change,
           params.quic_migrate_sessions_early,
           params.quic_allow_server_migration,
@@ -336,6 +339,9 @@ std::unique_ptr<base::Value> HttpNetworkSession::QuicInfoToValue() const {
                    params_.quic_max_server_configs_stored_in_properties);
   dict->SetInteger("idle_connection_timeout_seconds",
                    params_.quic_idle_connection_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",