Introduce FileSystemFileUtil and -Proxy to decorate base::file_util in webkit/fileapi.

webkit/fileapi/file_system_operation_context.h

Index: webkit/fileapi/file_system_operation_context.h
diff --git a/webkit/fileapi/file_system_operation_context.h b/webkit/fileapi/file_system_operation_context.h
new file mode 100644
index 0000000000000000000000000000000000000000..29cc1eb8080cd84a6c43b7797cd059ee14716995
--- /dev/null
+++ b/webkit/fileapi/file_system_operation_context.h
@@ -0,0 +1,32 @@
+// 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_FILE_SYSTEM_OPERATION_CONTEXT_H_
+#define WEBKIT_FILEAPI_FILE_SYSTEM_OPERATION_CONTEXT_H_
+
+namespace fileapi {
+
+class FileSystemContext;
+class FileSystemFileUtil;
+
+class FileSystemOperationContext {
+ public:
+  FileSystemOperationContext(FileSystemContext* file_system_context) :
+      file_system_context_(file_system_context) {
+  }
+  ~FileSystemOperationContext() {
+  }
+
+  FileSystemContext* file_system_context() {
+    return file_system_context_.get();
+  }
+
+ private:
+  scoped_refptr<FileSystemContext> file_system_context_;
+};
+
+}  // namespace fileapi
+
+#endif  // WEBKIT_FILEAPI_FILE_SYSTEM_OPERATION_CONTEXT_H_
+