Stackable file_util for FileAPIs. Sample code for discussion. Incomplete. Cannot be compiled.

webkit/fileapi/obfuscated_file_util.cc

+// 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.
+
+#include "webkit/fileapi/file_system_file_util_base.h"
+#include "webkit/fileapi/file_system_operation_context.h"
+
+#include "base/file_util.h"
+
+namespace fileapi {
+
+// static
+ObfuscatedFileUtil* ObfuscatedFileUtil::GetInstance() {
+  ObfuscatedFileUtil* self = Singleton<ObfuscatedFileUtil>::get();
+  self->next_file_util_to_obfuscation = QuotaFileUtil::GetInstance();
+  return self;
+}
+
+base::PlatformFileError ObfuscatedFileUtil::CreateDirectory(
+    const FileSystemOperationContext& fs_context,
+    const FilePath& file_path,
+    bool exclusive,
+    bool recursive) {
+  PlatformFileError error = base::PLATFORM_FILE_OK;
+  // Take information about virtual/real path from fs_context.
+
+  if (!file_util::CreateDirectory(full_path)) {
+    obfuscator.RollBack();
+    return base::PLATFORM_FILE_ERROR_FAILED;
+  }
+
+  // ...
+}
+
+}  // namespace fileapi