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diff --git a/WebCore/fileapi/FileReaderSync.h b/WebCore/fileapi/FileReaderSync.h
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+/*
+ * Copyright (C) 2010 Google 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 FileReaderSync_h
+#define FileReaderSync_h
+
+#if ENABLE(BLOB)
+
+#include "ExceptionCode.h"
+#include "ScriptString.h"
+#include <wtf/PassRefPtr.h>
+#include <wtf/RefCounted.h>
+
+namespace WebCore {
+
+class Blob;
+class ScriptExecutionContext;
+
+class FileReaderSync : public RefCounted<FileReaderSync> {
+public:
+    static PassRefPtr<FileReaderSync> create()
+    {
+        return adoptRef(new FileReaderSync());
+    }
+
+    virtual ~FileReaderSync() { }
+
+    const ScriptString& readAsBinaryString(ScriptExecutionContext*, Blob*, ExceptionCode&);
+    const ScriptString& readAsText(ScriptExecutionContext* scriptExecutionContext, Blob* blob, ExceptionCode& ec)
+    {
+        return readAsText(scriptExecutionContext, blob, "", ec);
+    }
+    const ScriptString& readAsText(ScriptExecutionContext*, Blob*, const String& encoding, ExceptionCode&);
+    const ScriptString& readAsDataURL(ScriptExecutionContext*, Blob*, ExceptionCode&);
+
+private:
+    enum ReadType {
+        ReadAsBinaryString,
+        ReadAsText,
+        ReadAsDataURL
+    };
+
+    FileReaderSync();
+    
+    void read(ScriptExecutionContext*, Blob*, ReadType, ExceptionCode&);
+    void convertToText(const char* data, int size, ScriptString& result);
+
+    // Like XMLHttpRequest.m_responseText, we keep this as a ScriptString, not a WTF::String.
+    // That's because these strings can easily get huge (they are filled from the file) and
+    // because JS can easily observe many intermediate states, so it's very useful to be
+    // able to share the buffer with JavaScript versions of the whole or partial string.
+    // In contrast, this string doesn't interact much with the rest of the engine so it's not that
+    // big a cost that it isn't a String.
+    ScriptString m_result;
+
+    String m_encoding;
+};
+
+} // namespace WebCore
+
+#endif // ENABLE(BLOB)
+
+#endif // FileReaderSync_h