Add GetBoundAddress to PPB_UDPSocket_Private

ppapi/api/private/ppb_udp_socket_private.idl

Index: ppapi/api/private/ppb_udp_socket_private.idl
diff --git a/ppapi/api/private/ppb_udp_socket_private.idl b/ppapi/api/private/ppb_udp_socket_private.idl
index 4babbb4a4dbd915a962d354947fd3f986b5d4823..463c726947322fd8255407a93e4465b2b41263a8 100644
--- a/ppapi/api/private/ppb_udp_socket_private.idl
+++ b/ppapi/api/private/ppb_udp_socket_private.idl
@@ -8,7 +8,8 @@
  */
 
 label Chrome {
-  M17 = 0.2
+  M17 = 0.2,
+  M18 = 0.3
 };
 
 interface PPB_UDPSocket_Private {
@@ -27,6 +28,14 @@ interface PPB_UDPSocket_Private {
                [in] PP_NetAddress_Private addr,
                [in] PP_CompletionCallback callback);
 
+  /* Returns the address that the socket has bound to.  If there has
+   * not been a successful call to Bind, or the socket has been closed,
+   * an error is returned.
+   */
+  [version=0.3]
+  PP_Bool GetBoundAddress([in] PP_Resource udp_socket,
+                          [out] PP_NetAddress_Private addr);
+
   /* 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