QUIC: Add packet_reader_yield_after_duration_milliseconds field trial param.

net/quic/chromium/quic_stream_factory.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_QUIC_QUIC_STREAM_FACTORY_H_
 #define NET_QUIC_QUIC_STREAM_FACTORY_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 172 matching lines @@
       float packet_loss_threshold,
       int max_recent_disabled_reasons,
       int threshold_timeouts_with_streams_open,
       int threshold_public_resets_post_handshake,
       int socket_receive_buffer_size,
       bool delay_tcp_race,
       int max_server_configs_stored_in_properties,
       bool close_sessions_on_ip_change,
       bool disable_quic_on_timeout_with_open_streams,
       int idle_connection_timeout_seconds,
+      int packet_reader_yield_after_duration_milliseconds,
       bool migrate_sessions_on_network_change,
       bool migrate_sessions_early,
       bool allow_server_migration,
       bool force_hol_blocking,
       bool race_cert_verification,
       const QuicTagVector& connection_options,
       bool enable_token_binding);
   ~QuicStreamFactory() override;
 
   // Returns true if there is an existing session for |server_id| or if the
@@ skipping 447 matching lines @@
   const scoped_refptr<SSLConfigService> ssl_config_service_;
 
   base::WeakPtrFactory<QuicStreamFactory> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicStreamFactory);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_STREAM_FACTORY_H_