Add GetBoundAddress to PPB_UDPSocket_Private

ppapi/api/private/ppb_udp_socket_private.idl

 /* 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 defines the <code>PPB_UDPSocket_Private</code> interface.
  */
 
 label Chrome {
   M17 = 0.2
 };
 
 interface PPB_UDPSocket_Private {
   /**
    * Creates a UDP socket resource.
    */
   PP_Resource Create([in] PP_Instance instance_id);
 
   /**
    * Determines if a given resource is a UDP socket.
    */
   PP_Bool IsUDPSocket([in] 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([in] PP_Resource udp_socket,
                [in] PP_NetAddress_Private addr,

[yzshen1, 2012/01/27 18:41:07]

- Isn't the port information included in |addr| itself?
Am I missing anything?

- The int32_t is a value from pp_errors.h. All non-positive values are reserved.
0 means PP_OK here.

                [in] 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([in] PP_Resource udp_socket,
                    [out] str_t buffer,
                    [in] int32_t num_bytes,
@@ skipping 11 matching lines @@
    */
   int32_t SendTo([in] PP_Resource udp_socket,
                  [in] str_t buffer,
                  [in] int32_t num_bytes,
                  [in] PP_NetAddress_Private addr,
                  [in] PP_CompletionCallback callback);
 
   /* Cancels all pending reads and writes, and closes the socket. */
   void Close([in] PP_Resource udp_socket);
 };