Add support for setting QUIC connection options via field trial config.

net/http/http_network_session.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_HTTP_HTTP_NETWORK_SESSION_H_
 #define NET_HTTP_HTTP_NETWORK_SESSION_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 101 matching lines @@
     bool enable_quic_time_based_loss_detection;
     bool enable_quic_persist_server_info;
     HostPortPair origin_to_force_quic_on;
     QuicClock* quic_clock;  // Will be owned by QuicStreamFactory.
     QuicRandom* quic_random;
     size_t quic_max_packet_length;
     std::string quic_user_agent_id;
     bool enable_user_alternate_protocol_ports;
     QuicCryptoClientStreamFactory* quic_crypto_client_stream_factory;
     QuicVersionVector quic_supported_versions;
+    QuicTagVector quic_connection_options;
   };
 
   enum SocketPoolType {
     NORMAL_SOCKET_POOL,
     WEBSOCKET_SOCKET_POOL,
     NUM_SOCKET_POOL_TYPES
   };
 
   explicit HttpNetworkSession(const Params& params);
 
@@ skipping 104 matching lines @@
 
   std::vector<std::string> next_protos_;
   bool enabled_protocols_[NUM_VALID_ALTERNATE_PROTOCOLS];
 
   Params params_;
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_NETWORK_SESSION_H_