Gather metrics classifying the cause of the TLS fallback.

net/socket/ssl_client_socket.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_SOCKET_SSL_CLIENT_SOCKET_H_
 #define NET_SOCKET_SSL_CLIENT_SOCKET_H_
 
 #include <string>
 
 #include "base/gtest_prod_util.h"
 #include "net/base/completion_callback.h"
 #include "net/base/load_flags.h"
 #include "net/base/net_errors.h"
 #include "net/socket/ssl_socket.h"
 #include "net/socket/stream_socket.h"
+#include "net/ssl/ssl_failure_state.h"
 
 namespace net {
 
 class CertPolicyEnforcer;
 class CertVerifier;
 class ChannelIDService;
 class CTVerifier;
 class SSLCertRequestInfo;
 struct SSLConfig;
 class SSLInfo;
@@ skipping 96 matching lines @@
   static void ClearSessionCache();
 
   // Get the maximum SSL version supported by the underlying library and
   // cryptographic implementation.
   static uint16 GetMaxSupportedSSLVersion();
 
   // Returns the ChannelIDService used by this socket, or NULL if
   // channel ids are not supported.
   virtual ChannelIDService* GetChannelIDService() const = 0;
 
+  // Returns the state of the handshake when it failed, or |SSL_FAILURE_NONE| if
+  // the handshake succeeded. This is used to classify causes of the TLS version
+  // fallback.
+  virtual SSLFailureState GetSSLFailureState() const = 0;
+
  protected:
   void set_negotiation_extension(
       SSLNegotiationExtension negotiation_extension) {
     negotiation_extension_ = negotiation_extension;
   }
 
   void set_signed_cert_timestamps_received(
       bool signed_cert_timestamps_received) {
     signed_cert_timestamps_received_ = signed_cert_timestamps_received;
   }
@@ skipping 60 matching lines @@
   bool signed_cert_timestamps_received_;
   // True if a stapled OCSP response was received.
   bool stapled_ocsp_response_received_;
   // Protocol negotiation extension used.
   SSLNegotiationExtension negotiation_extension_;
 };
 
 }  // namespace net
 
 #endif  // NET_SOCKET_SSL_CLIENT_SOCKET_H_