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

ppapi/c/ppb_udp_socket.h

Index: ppapi/c/ppb_udp_socket.h
diff --git a/ppapi/c/ppb_udp_socket.h b/ppapi/c/ppb_udp_socket.h
index 5551c3388f47bcda98e26317a79851c1310abdd8..70e9345c43681dc72d4c09d0aff6e4f9f110634c 100644
--- a/ppapi/c/ppb_udp_socket.h
+++ b/ppapi/c/ppb_udp_socket.h
@@ -3,7 +3,7 @@
  * found in the LICENSE file.
  */
 
-/* From ppb_udp_socket.idl modified Sat Jun 22 10:56:26 2013. */
+/* From ppb_udp_socket.idl modified Wed Oct  8 14:19:56 2014. */
 
 #ifndef PPAPI_C_PPB_UDP_SOCKET_H_
 #define PPAPI_C_PPB_UDP_SOCKET_H_
@@ -168,6 +168,9 @@ struct PPB_UDPSocket_1_0 {
    * been sent; otherwise, an error code from <code>pp_errors.h</code>.
    * <code>PP_ERROR_NOACCESS</code> will be returned if the caller doesn't have
    * required permissions.
+   * <code>PP_ERROR_INPROGRESS</code> will be returned if the socket is busy
+   * sending. The caller should wait until a pending send completes before
+   * retrying.
    */
   int32_t (*SendTo)(PP_Resource udp_socket,
                     const char* buffer,