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diff --git a/webkit/fileapi/webfilewriter_base.h b/webkit/fileapi/webfilewriter_base.h
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+++ b/webkit/fileapi/webfilewriter_base.h
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+// Copyright (c) 2010 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_WEBFILEWRITER_BASE_H_
+#define WEBKIT_FILEAPI_WEBFILEWRITER_BASE_H_
+
+#include "base/file_path.h"
+#include "base/platform_file.h"
+#include "third_party/WebKit/WebKit/chromium/public/WebFileWriter.h"
+
+class GURL;
+
+namespace WebKit {
+class WebFileWriterClient;
+class WebString;
+class WebURL;
+}
+
+namespace fileapi {
+
+class WebFileWriterBase : public WebKit::WebFileWriter {
+ public:
+  WebFileWriterBase(
+      const WebKit::WebString& path, WebKit::WebFileWriterClient* client);
+  virtual ~WebFileWriterBase();
+
+  // WebFileWriter implementation
+  virtual void truncate(long long length);
+  virtual void write(long long position, const WebKit::WebURL& blobURL);
+  virtual void cancel();
+
+ protected:
+  // Derived classes must provide these methods to asynchronously perform
+  // the requested operation, and they must call the appropiate DidSomething
+  // method upon completion and as progress is made in the Write case.
+  virtual void DoTruncate(const FilePath& path, int64 offset) = 0;
+  virtual void DoWrite(const FilePath& path, const GURL& blob_url,
+                       int64 offset) = 0;
+  virtual void DoCancel() = 0;
+
+  void DidSucceed();
+  void DidFail(base::PlatformFileError error_code);
+  void DidWrite(int64 bytes, bool complete);
+
+ private:
+  enum OperationType {
+    kOperationNone,
+    kOperationWrite,
+    kOperationTruncate
+  };
+
+  enum CancelState {
+    kCancelNotInProgress,
+    kCancelSent,
+    kCancelReceivedWriteResponse,
+  };
+
+  void FinishCancel();
+
+  FilePath path_;
+  WebKit::WebFileWriterClient* client_;
+  OperationType operation_;
+  CancelState cancel_state_;
+};
+
+}  // namespace fileapi
+
+#endif  // WEBKIT_FILEAPI_WEBFILEWRITER_BASE_H_