Add QUIC handshake accounting. Protected by

net/quic/core/quic_crypto_server_stream.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_CORE_QUIC_CRYPTO_SERVER_STREAM_H_
 #define NET_QUIC_CORE_QUIC_CRYPTO_SERVER_STREAM_H_
 
 #include <cstdint>
 #include <memory>
 #include <string>
@@ skipping 39 matching lines @@
 
   // Sends the latest server config and source-address token to the client.
   virtual void SendServerConfigUpdate(
       const CachedNetworkParameters* cached_network_params) = 0;
 
   // These are all accessors and setters to their respective counters.
   virtual uint8_t NumHandshakeMessages() const = 0;
   virtual uint8_t NumHandshakeMessagesWithServerNonces() const = 0;
   virtual bool UseStatelessRejectsIfPeerSupported() const = 0;
   virtual bool PeerSupportsStatelessRejects() const = 0;
+  virtual bool ZeroRttAttempted() const = 0;
   virtual void SetPeerSupportsStatelessRejects(bool set) = 0;
   virtual const CachedNetworkParameters* PreviousCachedNetworkParams()
       const = 0;
   virtual void SetPreviousCachedNetworkParams(
       CachedNetworkParameters cached_network_params) = 0;
 
   // Checks the options on the handshake-message to see whether the
   // peer supports stateless-rejects.
   static bool DoesPeerSupportStatelessRejects(
       const CryptoHandshakeMessage& message);
@@ skipping 35 matching lines @@
   void OnHandshakeMessage(const CryptoHandshakeMessage& message) override;
   bool GetBase64SHA256ClientChannelID(std::string* output) const override;
   void SendServerConfigUpdate(
       const CachedNetworkParameters* cached_network_params) override;
   uint8_t NumHandshakeMessages() const override;
   uint8_t NumHandshakeMessagesWithServerNonces() const override;
   int NumServerConfigUpdateMessagesSent() const override;
   const CachedNetworkParameters* PreviousCachedNetworkParams() const override;
   bool UseStatelessRejectsIfPeerSupported() const override;
   bool PeerSupportsStatelessRejects() const override;
+  bool ZeroRttAttempted() const override;
   void SetPeerSupportsStatelessRejects(
       bool peer_supports_stateless_rejects) override;
   void SetPreviousCachedNetworkParams(
       CachedNetworkParameters cached_network_params) override;
 
   // NOTE: Indicating that the Expect-CT header should be sent here presents
   // a layering violation to some extent. The Expect-CT header only applies to
   // HTTP connections, while this class can be used for non-HTTP applications.
   // However, it is exposed here because that is the only place where the
   // configuration for the certificate used in the connection is accessible.
@@ skipping 131 matching lines @@
   // client supports them, as indicated by
   // peer_supports_stateless_rejects_.
   bool use_stateless_rejects_if_peer_supported_;
 
   // Set to true, once the server has received information from the
   // client that it supports stateless reject.
   //  TODO(jokulik): Remove once client stateless reject support
   // becomes the default.
   bool peer_supports_stateless_rejects_;
 
+  // True if client attempts 0-rtt handshake (which can succeed or fail). If
+  // stateless rejects are used, this variable will be false for the stateless
+  // rejected connection and true for subsequent connections.
+  bool zero_rtt_attempted_;
+
   // Size of the packet containing the most recently received CHLO.
   QuicByteCount chlo_packet_size_;
 
   // Pointer to the active callback that will receive the result of the client
   // hello validation request and forward it to FinishProcessingHandshakeMessage
   // for processing.  nullptr if no handshake message is being validated.  Note
   // that this field is mutually exclusive with process_client_hello_cb_.
   ValidateCallback* validate_client_hello_cb_;
 
   // Pointer to the active callback which will receive the results of
   // ProcessClientHello and forward it to
   // FinishProcessingHandshakeMessageAfterProcessClientHello.  Note that this
   // field is mutually exclusive with validate_client_hello_cb_.
   ProcessClientHelloCallback* process_client_hello_cb_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicCryptoServerStream);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_CORE_QUIC_CRYPTO_SERVER_STREAM_H_