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

webkit/fileapi/quota_file_util.h

Index: webkit/fileapi/quota_file_util.h
diff --git a/webkit/fileapi/quota_file_util.h b/webkit/fileapi/quota_file_util.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 WEBKIT_FILEAPI_QUOTA_FILE_UTIL_H_
+#define WEBKIT_FILEAPI_QUOTA_FILE_UTIL_H_
+
+namespace fileapi {
+
+class QuotaFileUtil : public FileSystemFileUtilBase {
+ public:
+  bool CopyFile(const FileSystemOperationContext& fs_context,
+                const FilePath& from_path, const FilePath& to_path);
+};
+
+}  // namespace fileapi
+
+#endif  // WEBKIT_FILEAPI_QUOTA_FILE_UTIL_H_