Server push cancellation: add a finch trial parameter

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 <stddef.h>
 #include <stdint.h>
 
@@ skipping 67 matching lines @@
       public base::MemoryCoordinatorClient {
  public:
   struct NET_EXPORT Params {
     Params();
     Params(const Params& other);
     ~Params();
 
     ClientSocketFactory* client_socket_factory;
     HostResolver* host_resolver;
     CertVerifier* cert_verifier;
+    bool enable_server_push_cancellation;
     ChannelIDService* channel_id_service;
     TransportSecurityState* transport_security_state;
     CTVerifier* cert_transparency_verifier;
     CTPolicyEnforcer* ct_policy_enforcer;
     ProxyService* proxy_service;
     SSLConfigService* ssl_config_service;
     HttpAuthHandlerFactory* http_auth_handler_factory;
     HttpServerProperties* http_server_properties;
     NetLog* net_log;
     HostMappingRules* host_mapping_rules;
@@ skipping 252 matching lines @@
   NextProtoVector next_protos_;
 
   Params params_;
 
   std::unique_ptr<base::MemoryPressureListener> memory_pressure_listener_;
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_NETWORK_SESSION_H_