Expose OpenSSL's key_exchange_info in the content API

net/socket/ssl_client_socket_openssl.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.
 
 // OpenSSL binding for SSLClientSocket. The class layout and general principle
 // of operation is derived from SSLClientSocketNSS.
 
 #include "net/socket/ssl_client_socket_openssl.h"
 
 #include <errno.h>
@@ skipping 709 matching lines @@
   ssl_info->client_cert_sent =
       ssl_config_.send_client_cert && ssl_config_.client_cert.get();
   ssl_info->channel_id_sent = channel_id_sent_;
   ssl_info->pinning_failure_log = pinning_failure_log_;
 
   AddSCTInfoToSSLInfo(ssl_info);
 
   const SSL_CIPHER* cipher = SSL_get_current_cipher(ssl_);
   CHECK(cipher);
   ssl_info->security_bits = SSL_CIPHER_get_bits(cipher, NULL);
+  ssl_info->key_exchange_info =
+      SSL_SESSION_get_key_exchange_info(SSL_get_session(ssl_));
 
   ssl_info->connection_status = EncodeSSLConnectionStatus(
       static_cast<uint16>(SSL_CIPHER_get_id(cipher)), 0 /* no compression */,
       GetNetSSLVersion(ssl_));
 
   if (!SSL_get_secure_renegotiation_support(ssl_))
     ssl_info->connection_status |= SSL_CONNECTION_NO_RENEGOTIATION_EXTENSION;
 
   if (ssl_config_.version_fallback)
     ssl_info->connection_status |= SSL_CONNECTION_VERSION_FALLBACK;
@@ skipping 1397 matching lines @@
     OnHandshakeIOComplete(signature_result_);
     return;
   }
 
   // During a renegotiation, either Read or Write calls may be blocked on an
   // asynchronous private key operation.
   PumpReadWriteEvents();
 }
 
 }  // namespace net