Initial work for UDP Pepper API

ppapi/c/private/ppb_flash_udp_socket.h

Index: ppapi/c/private/ppb_flash_udp_socket.h
diff --git a/ppapi/c/private/ppb_flash_udp_socket.h b/ppapi/c/private/ppb_flash_udp_socket.h
new file mode 100644
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+++ b/ppapi/c/private/ppb_flash_udp_socket.h
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+// Copyright (c) 2011 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.
+
+#ifndef PPAPI_C_PRIVATE_PPB_FLASH_UDP_SOCKET_H_
+#define PPAPI_C_PRIVATE_PPB_FLASH_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_resource.h"
+#include "ppapi/c/pp_stdint.h"
+#include "ppapi/c/private/ppb_flash_tcp_socket.h"  // for PP_Flash_NetAddress
+
+#define PPB_FLASH_UDPSOCKET_INTERFACE "PPB_Flash_UDPSocket;0.1"
+
+struct PPB_Flash_UDPSocket {
+  PP_Resource (*Create)(PP_Instance instance);
+
+  PP_Bool (*IsFlashUDPSocket)(PP_Resource resource);
+
+  // Creates a socket and binds to the address given by |addr|.
+  int32_t (*Bind)(PP_Resource udp_socket,
+                  const struct PP_Flash_NetAddress* 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,
+                      int32_t num_bytes,
+                      struct PP_CompletionCallback callback);
+
+  // Upon successful completion of RecvFrom, the address that the data
+  // was received from is stored in |addr|.
+  PP_Bool (*GetRecvFromAddress)(PP_Resource udp_socket,
+                                struct PP_Flash_NetAddress* addr);
+
+  // Performs a non-blocking sendto call on the socket created and
+  // bound(has already called Bind).  The callback |callback| is
+  // invoked when sendto completes.
+  int32_t (*SendTo)(PP_Resource udp_socket,
+                    const char* buffer,
+                    int32_t num_bytes,
+                    const struct PP_Flash_NetAddress* addr,
+                    struct PP_CompletionCallback callback);
+
+  // Cancels all pending reads and writes, and closes the socket.
+  void (*Close)(PP_Resource udp_socket);
+};
+
+#endif  // PPAPI_C_PRIVATE_PPB_FLASH_UDP_SOCKET_H_
+