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diff --git a/Source/WebCore/fileapi/AsyncFileStream.h b/Source/WebCore/fileapi/AsyncFileStream.h
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+++ b/Source/WebCore/fileapi/AsyncFileStream.h
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+/*
+ * Copyright (C) 2010 Google Inc.  All rights reserved.
+ * Copyright (C) 2010, 2012 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef AsyncFileStream_h
+#define AsyncFileStream_h
+
+#if ENABLE(BLOB)
+
+#include <wtf/Forward.h>
+#include <wtf/RefCounted.h>
+#include <wtf/RefPtr.h>
+
+namespace WebCore {
+
+class FileStreamClient;
+class FileStream;
+class FileThread;
+class KURL;
+class ScriptExecutionContext;
+
+class AsyncFileStream : public RefCounted<AsyncFileStream> {
+public:
+    static PassRefPtr<AsyncFileStream> create(ScriptExecutionContext*, FileStreamClient*);
+    ~AsyncFileStream();
+
+    void getSize(const String& path, double expectedModificationTime);
+    void openForRead(const String& path, long long offset, long long length);
+    void openForWrite(const String& path);
+    void close();
+    void read(char* buffer, int length);
+    void write(const KURL& blobURL, long long position, int length);
+    void truncate(long long position);
+
+    // Stops the proxy and schedules it to be destructed. All the pending tasks will be aborted and the file stream will be closed.
+    // Note: the caller should deref the instance immediately after calling stop().
+    void stop();
+
+    FileStreamClient* client() const { return m_client; }
+    void setClient(FileStreamClient* client) { m_client = client; }
+
+private:
+    AsyncFileStream(ScriptExecutionContext*, FileStreamClient*);
+
+    FileThread* fileThread();
+
+    // Called on File thread.
+    void startOnFileThread();
+    void stopOnFileThread();
+    void getSizeOnFileThread(const String& path, double expectedModificationTime);
+    void openForReadOnFileThread(const String& path, long long offset, long long length);
+    void openForWriteOnFileThread(const String& path);
+    void closeOnFileThread();
+    void readOnFileThread(char* buffer, int length);
+    void writeOnFileThread(const KURL& blobURL, long long position, int length);
+    void truncateOnFileThread(long long position);
+
+    RefPtr<ScriptExecutionContext> m_context;
+    RefPtr<FileStream> m_stream;
+
+    FileStreamClient* m_client;
+};
+
+} // namespace WebCore
+
+#endif // ENABLE(BLOB)
+
+#endif // AsyncFileStream_h