Add RequestOSFileHandle as a private PPAPI

ppapi/thunk/ppb_file_io_private_thunk.cc

Index: ppapi/thunk/ppb_file_io_private_thunk.cc
diff --git a/ppapi/thunk/ppb_file_io_private_thunk.cc b/ppapi/thunk/ppb_file_io_private_thunk.cc
new file mode 100644
index 0000000000000000000000000000000000000000..20c7971a2a0fe7d3482554c039cf03f35a1ae831
--- /dev/null
+++ b/ppapi/thunk/ppb_file_io_private_thunk.cc
@@ -0,0 +1,44 @@
+// 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 Tue Mar 26 15:29:46 2013.
+
+#include "ppapi/c/pp_completion_callback.h"
+#include "ppapi/c/pp_errors.h"
+#include "ppapi/c/private/ppb_file_io_private.h"
+#include "ppapi/shared_impl/tracked_callback.h"
+#include "ppapi/thunk/enter.h"
+#include "ppapi/thunk/ppb_file_io_api.h"
+#include "ppapi/thunk/ppb_instance_api.h"
+#include "ppapi/thunk/resource_creation_api.h"
+#include "ppapi/thunk/thunk.h"
+
+namespace ppapi {
+namespace thunk {
+
+namespace {
+
+int32_t RequestOSFileHandle(PP_Resource file_io,
+                            PP_FileHandle* handle,
+                            struct PP_CompletionCallback callback) {
+  EnterResource<PPB_FileIO_API> enter(file_io, callback, true);
+  if (enter.failed())
+    return enter.retval();
+  return enter.SetResult(enter.object()->RequestOSFileHandle(
+      handle,
+      enter.callback()));
+}
+
+const PPB_FileIO_Private_0_1 g_ppb_fileio_private_thunk_0_1 = {
+  &RequestOSFileHandle
+};
+
+}  // namespace
+
+const PPB_FileIO_Private_0_1* GetPPB_FileIO_Private_0_1_Thunk() {
+  return &g_ppb_fileio_private_thunk_0_1;
+}
+
+}  // namespace thunk
+}  // namespace ppapi