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diff --git a/webkit/support/simple_file_writer.h b/webkit/support/simple_file_writer.h
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+++ b/webkit/support/simple_file_writer.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_SUPPORT_SIMPLE_FILE_WRITER_H_
+#define WEBKIT_SUPPORT_SIMPLE_FILE_WRITER_H_
+
+#include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
+#include "webkit/renderer/fileapi/webfilewriter_base.h"
+
+namespace net {
+class URLRequestContext;
+}  // namespace net
+
+namespace fileapi {
+class FileSystemContext;
+}
+
+// An implementation of WebFileWriter for use in test_shell and DRT.
+class SimpleFileWriter : public fileapi::WebFileWriterBase,
+                         public base::SupportsWeakPtr<SimpleFileWriter> {
+ public:
+  SimpleFileWriter(
+      const GURL& path,
+      WebKit::WebFileWriterClient* client,
+      fileapi::FileSystemContext* file_system_context);
+  virtual ~SimpleFileWriter();
+
+  // Called by SimpleResourceLoaderBridge when the context is
+  // created and destroyed.
+  static void InitializeOnIOThread(net::URLRequestContext* request_context) {
+    request_context_ = request_context;
+  }
+  static void CleanupOnIOThread() {
+    request_context_ = NULL;
+  }
+
+ protected:
+  // WebFileWriterBase overrides
+  virtual void DoTruncate(const GURL& path, int64 offset) OVERRIDE;
+  virtual void DoWrite(const GURL& path, const GURL& blob_url,
+                       int64 offset) OVERRIDE;
+  virtual void DoCancel() OVERRIDE;
+
+ private:
+  class IOThreadProxy;
+  scoped_refptr<fileapi::FileSystemContext> file_system_context_;
+  scoped_refptr<IOThreadProxy> io_thread_proxy_;
+  static net::URLRequestContext* request_context_;
+};
+
+#endif  // WEBKIT_SUPPORT_SIMPLE_FILE_WRITER_H_