Server push cancellation: add a finch trial parameter

net/tools/quic/quic_simple_dispatcher.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_TOOLS_QUIC_QUIC_SIMPLE_DISPATCHER_H_
 #define NET_TOOLS_QUIC_QUIC_SIMPLE_DISPATCHER_H_
 
 #include "net/quic/core/quic_server_session_base.h"
 #include "net/tools/quic/quic_dispatcher.h"
 #include "net/tools/quic/quic_http_response_cache.h"
 
 namespace net {
 
 class QuicSimpleDispatcher : public QuicDispatcher {
  public:
   QuicSimpleDispatcher(
       const QuicConfig& config,
       const QuicCryptoServerConfig* crypto_config,
       QuicVersionManager* version_manager,
       std::unique_ptr<QuicConnectionHelperInterface> helper,
       std::unique_ptr<QuicCryptoServerStream::Helper> session_helper,
       std::unique_ptr<QuicAlarmFactory> alarm_factory,
       QuicHttpResponseCache* response_cache);
 
   ~QuicSimpleDispatcher() override;
 
+  int GetRstErrorCount(QuicRstStreamErrorCode rst_error_code) const;
+
+  void OnRstStreamReceived(const QuicRstStreamFrame& frame) override;
+
  protected:
   QuicServerSessionBase* CreateQuicSession(
       QuicConnectionId connection_id,
       const QuicSocketAddress& client_address) override;
 
   QuicHttpResponseCache* response_cache() { return response_cache_; }
 
  private:
   QuicHttpResponseCache* response_cache_;  // Unowned.
+
+  // The map of the reset error code with its counter.
+  std::map<QuicRstStreamErrorCode, int> rst_error_map_;
 };
 
 }  // namespace net
 
 #endif  // NET_TOOLS_QUIC_QUIC_SIMPLE_DISPATCHER_H_