Add GetBoundAddress to PPB_UDPSocket_Private

ppapi/c/private/ppb_udp_socket_private.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.
  */
 
 /* From private/ppb_udp_socket_private.idl modified Wed Nov 16 15:27:20 2011. */
 
 #ifndef PPAPI_C_PRIVATE_PPB_UDP_SOCKET_PRIVATE_H_
 #define PPAPI_C_PRIVATE_PPB_UDP_SOCKET_PRIVATE_H_
 
@@ skipping 20 matching lines @@
  */
 struct PPB_UDPSocket_Private_0_2 {
   /**
    * Creates a UDP socket resource.
    */
   PP_Resource (*Create)(PP_Instance instance_id);
   /**
    * Determines if a given resource is a UDP socket.
    */
   PP_Bool (*IsUDPSocket)(PP_Resource resource_id);
-  /* Creates a socket and binds to the address given by |addr|. */
+  /* Creates a socket and binds to the address given by |addr|.
+   * Returns the port number that the socket is bound to on
+   * success, 0 on failure
+   */
   int32_t (*Bind)(PP_Resource udp_socket,
                   const struct PP_NetAddress_Private* addr,
                   struct PP_CompletionCallback callback);
   /* Performs a non-blocking recvfrom call on socket.
    * Bind must be called first. |callback| is invoked when recvfrom
    * reads data.  You must call GetRecvFromAddress to recover the
    * address the data was retrieved from.
    */
   int32_t (*RecvFrom)(PP_Resource udp_socket,
                       char* buffer,
@@ skipping 17 matching lines @@
   void (*Close)(PP_Resource udp_socket);
 };
 
 typedef struct PPB_UDPSocket_Private_0_2 PPB_UDPSocket_Private;
 /**
  * @}
  */
 
 #endif  /* PPAPI_C_PRIVATE_PPB_UDP_SOCKET_PRIVATE_H_ */