Add a new GetTlsUniqueChannelBinding method to SSLSocket, and implement nss version.

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 <openssl/ssl.h>
@@ skipping 645 matching lines @@
   if (rv != 1) {
     int ssl_error = SSL_get_error(ssl_, rv);
     LOG(ERROR) << "Failed to export keying material;"
                << " returned " << rv
                << ", SSL error code " << ssl_error;
     return MapOpenSSLError(ssl_error, err_tracer);
   }
   return OK;
 }
 
+int SSLClientSocketOpenSSL::GetTLSUniqueChannelBinding(std::string* out) {
+  return ERR_NOT_IMPLEMENTED;
+}
+
 SSLClientSocket::NextProtoStatus SSLClientSocketOpenSSL::GetNextProto(
     std::string* proto, std::string* server_protos) {
   *proto = npn_proto_;
   *server_protos = server_protos_;
   return npn_status_;
 }
 
 ServerBoundCertService*
 SSLClientSocketOpenSSL::GetServerBoundCertService() const {
   return NULL;
@@ skipping 641 matching lines @@
     net_log_.AddByteTransferEvent(NetLog::TYPE_SSL_SOCKET_BYTES_SENT, rv,
                                   user_write_buf_->data());
     return rv;
   }
 
   int err = SSL_get_error(ssl_, rv);
   return MapOpenSSLError(err, err_tracer);
 }
 
 }  // namespace net