Pepper: Allow plugins to call PPB_UDP_Socket::SendTo multiple times.

ppapi/tests/test_udp_socket.h

 // Copyright 2013 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 PPAPI_TESTS_TEST_UDP_SOCKET_H_
 #define PPAPI_TESTS_TEST_UDP_SOCKET_H_
 
 #include <string>
 
 #include "ppapi/c/pp_stdint.h"
@@ skipping 25 matching lines @@
                          std::string* message);
   std::string PassMessage(pp::UDPSocket* target,
                           pp::UDPSocket* source,
                           const pp::NetAddress& target_address,
                           const std::string& message,
                           pp::NetAddress* recvfrom_address);
 
   std::string TestReadWrite();
   std::string TestBroadcast();
   std::string TestSetOption();
+  std::string TestParallelSend();
 
   pp::NetAddress address_;
 };
 
 #endif  // PPAPI_TESTS_TEST_UDP_SOCKET_H_