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diff --git a/WebCore/platform/FileStreamClient.h b/WebCore/platform/FileStreamClient.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 FileStreamClient_h
+#define FileStreamClient_h
+
+#if ENABLE(BLOB) || ENABLE(FILE_WRITER)
+
+namespace WebCore {
+
+class FileStreamClient {
+public:
+    // For reading.
+    virtual void didRead(int) { }
+
+    // For writing.
+    virtual void didWrite(int) { }
+    virtual void didTruncate(bool) { }
+
+    // FIXME: To be removed when we switch to using BlobData.
+    virtual void didStart() { }
+
+    // For both reading and writing.
+    virtual void didOpen(bool) { }
+    virtual void didStop() { }
+    virtual void didGetSize(long long) { }
+
+protected:
+    virtual ~FileStreamClient() { }
+};
+
+} // namespace WebCore
+
+#endif // ENABLE(BLOB) || ENABLE(FILE_WRITER)
+
+#endif // FileStreamClient_h