Add RequestOSFileHandle as a private PPAPI

ppapi/c/private/ppb_file_io_private.h

Index: ppapi/c/private/ppb_file_io_private.h
diff --git a/ppapi/c/private/ppb_file_io_private.h b/ppapi/c/private/ppb_file_io_private.h
new file mode 100644
index 0000000000000000000000000000000000000000..cdbbae7727056e46db7a60c03e6019ae981f6bb6
--- /dev/null
+++ b/ppapi/c/private/ppb_file_io_private.h
@@ -0,0 +1,49 @@
+/* Copyright (c) 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 private/ppb_file_io_private.idl modified Wed Mar 27 14:43:25 2013. */
+
+#ifndef PPAPI_C_PRIVATE_PPB_FILE_IO_PRIVATE_H_
+#define PPAPI_C_PRIVATE_PPB_FILE_IO_PRIVATE_H_
+
+#include "ppapi/c/pp_completion_callback.h"
+#include "ppapi/c/pp_macros.h"
+#include "ppapi/c/pp_resource.h"
+#include "ppapi/c/pp_stdint.h"
+
+#define PPB_FILEIO_PRIVATE_INTERFACE_0_1 "PPB_FileIO_Private;0.1"
+#define PPB_FILEIO_PRIVATE_INTERFACE PPB_FILEIO_PRIVATE_INTERFACE_0_1
+
+/**
+ * @file
+ */
+
+
+#include "ppapi/c/private/pp_file_handle.h"
+
+/**
+ * @addtogroup Interfaces
+ * @{
+ */
+/* PPB_FileIO_Private interface */
+struct PPB_FileIO_Private_0_1 {
+  /**
+   * Returns a file handle corresponding to the given FileIO
+   * object.  The FileIO object must have been opened with a
+   * successful call to FileIO::Open.  The caller gets the ownership
+   * of the returned file handle and must close it.
+   */
+  int32_t (*RequestOSFileHandle)(PP_Resource file_io,
+                                 PP_FileHandle* handle,
+                                 struct PP_CompletionCallback callback);
+};
+
+typedef struct PPB_FileIO_Private_0_1 PPB_FileIO_Private;
+/**
+ * @}
+ */
+
+#endif  /* PPAPI_C_PRIVATE_PPB_FILE_IO_PRIVATE_H_ */
+