Add RequestOSFileHandle as a private PPAPI

ppapi/cpp/private/file_io_private.cc

Index: ppapi/cpp/private/file_io_private.cc
diff --git a/ppapi/cpp/private/file_io_private.cc b/ppapi/cpp/private/file_io_private.cc
new file mode 100644
index 0000000000000000000000000000000000000000..14793485cd0102aa81d1f92bcba9e91050b2f573
--- /dev/null
+++ b/ppapi/cpp/private/file_io_private.cc
@@ -0,0 +1,39 @@
+// 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.
+
+#include "ppapi/cpp/private/file_io_private.h"
+
+#include "ppapi/c/pp_errors.h"
+#include "ppapi/c/private/ppb_file_io_private.h"
+#include "ppapi/cpp/file_io.h"
+#include "ppapi/cpp/module_impl.h"
+
+namespace pp {
+
+namespace {
+
+template <> const char* interface_name<PPB_FileIO_Private>() {
+  return PPB_FILEIO_PRIVATE_INTERFACE_0_1;
+}
+
+}  // namespace
+
+FileIO_Private::FileIO_Private()
+    : FileIO() {
+}
+
+FileIO_Private::FileIO_Private(const InstanceHandle& instance)
+    : FileIO(instance) {
+}
+
+int32_t FileIO_Private::RequestOSFileHandle(PP_FileHandle* result_handle,
+                                            const CompletionCallback& cc) {
+  *result_handle = PP_kInvalidFileHandle;
+  if (has_interface<PPB_FileIO_Private>())
+    return get_interface<PPB_FileIO_Private>()->RequestOSFileHandle(
+        pp_resource(), result_handle, cc.pp_completion_callback());
+  return cc.MayForce(PP_ERROR_NOINTERFACE);
+}
+
+}  // namespace pp