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

ppapi/c/ppb_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.
  */
 
-/* From ppb_udp_socket.idl modified Wed Dec 10 04:11:03 2014. */
+/* From ppb_udp_socket.idl modified Wed Jan 14 13:13:19 2015. */
 
 #ifndef PPAPI_C_PPB_UDP_SOCKET_H_
 #define PPAPI_C_PPB_UDP_SOCKET_H_
 
 #include "ppapi/c/pp_bool.h"
 #include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_macros.h"
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/c/pp_stdint.h"
@@ skipping 150 matching lines @@
    * @param[in] num_bytes The number of bytes to send.
    * @param[in] addr A <code>PPB_NetAddress</code> resource holding the
    * destination address.
    * @param[in] callback A <code>PP_CompletionCallback</code> to be called upon
    * completion.
    *
    * @return A non-negative number on success to indicate how many bytes have
    * 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,
                     int32_t num_bytes,
                     PP_Resource addr,
                     struct PP_CompletionCallback callback);
   /**
    * Cancels all pending reads and writes, and closes the socket. Any pending
    * callbacks will still run, reporting <code>PP_ERROR_ABORTED</code> if
    * pending IO was interrupted. After a call to this method, no output
@@ skipping 51 matching lines @@
                        PP_UDPSocket_Option name,
                        struct PP_Var value,
                        struct PP_CompletionCallback callback);
 };
 /**
  * @}
  */
 
 #endif  /* PPAPI_C_PPB_UDP_SOCKET_H_ */