Gather metrics classifying the cause of the TLS fallback.

net/socket/ssl_client_socket_nss.cc

 // 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.
 
 // This file includes code SSLClientSocketNSS::DoVerifyCertComplete() derived
 // from AuthCertificateCallback() in
 // mozilla/security/manager/ssl/src/nsNSSCallbacks.cpp.
 
 /* ***** BEGIN LICENSE BLOCK *****
  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
@@ skipping 88 matching lines @@
 #include "net/cert/x509_certificate_net_log_param.h"
 #include "net/cert/x509_util.h"
 #include "net/cert_net/nss_ocsp.h"
 #include "net/http/transport_security_state.h"
 #include "net/log/net_log.h"
 #include "net/socket/client_socket_handle.h"
 #include "net/socket/nss_ssl_util.h"
 #include "net/ssl/ssl_cert_request_info.h"
 #include "net/ssl/ssl_cipher_suite_names.h"
 #include "net/ssl/ssl_connection_status_flags.h"
+#include "net/ssl/ssl_failure_state.h"
 #include "net/ssl/ssl_info.h"
 
 #if defined(USE_NSS_CERTS)
 #include <dlfcn.h>
 #endif
 
 namespace net {
 
 // State machines are easier to debug if you log state transitions.
 // Enable these if you want to see what's going on.
@@ skipping 3086 matching lines @@
 
 scoped_refptr<X509Certificate>
 SSLClientSocketNSS::GetUnverifiedServerCertificateChain() const {
   return core_->state().server_cert.get();
 }
 
 ChannelIDService* SSLClientSocketNSS::GetChannelIDService() const {
   return channel_id_service_;
 }
 
+SSLFailureState SSLClientSocketNSS::GetSSLFailureState() const {
+  if (completed_handshake_)
+    return SSL_FAILURE_NONE;
+  return SSL_FAILURE_UNKNOWN;
+}
+
 }  // namespace net