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diff --git a/chrome/browser/extensions/file_reader.h b/chrome/browser/extensions/file_reader.h
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+++ b/chrome/browser/extensions/file_reader.h
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+// Copyright (c) 2009 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 CHROME_BROWSER_EXTENSIONS_FILE_READER_H_
+#define CHROME_BROWSER_EXTENSIONS_FILE_READER_H_
+
+#include <string>
+
+#include "base/ref_counted.h"
+#include "base/task.h"
+#include "chrome/common/extensions/extension_resource.h"
+
+class MessageLoop;
+
+// This file defines an interface for reading a file asynchronously on a
+// background thread.
+// Consider abstracting out a FilePathProvider (ExtensionResource) and moving
+// back to chrome/browser/net if other subsystems want to use it.
+class FileReader : public base::RefCountedThreadSafe<FileReader> {
+ public:
+  // Reports success or failure and the data of the file upon success.
+  typedef Callback2<bool, const std::string&>::Type Callback;
+
+  FileReader(const ExtensionResource& resource, Callback* callback);
+
+  // Called to start reading the file on a background thread.  Upon completion,
+  // the callback will be notified of the results.
+  void Start();
+
+ private:
+  void ReadFileOnBackgroundThread();
+  void RunCallback(bool success, const std::string& data);
+
+  ExtensionResource resource_;
+  Callback* callback_;
+  MessageLoop* origin_loop_;
+};
+
+#endif  // CHROME_BROWSER_EXTENSIONS_FILE_READER_H_