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diff --git a/WebKit/chromium/src/AsyncFileWriterChromium.cpp b/WebKit/chromium/src/AsyncFileWriterChromium.cpp
new file mode 100644
index 0000000..71cf3b5
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+++ b/WebKit/chromium/src/AsyncFileWriterChromium.cpp
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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.
+ */
+
+#include "config.h"
+#include "AsyncFileWriterChromium.h"
+
+#if ENABLE(FILE_SYSTEM)
+
+#include "AsyncFileWriterClient.h"
+#include "Blob.h"
+#include "WebFileWriter.h"
+#include "WebURL.h"
+
+namespace WebCore {
+
+AsyncFileWriterChromium::AsyncFileWriterChromium(AsyncFileWriterClient* client)
+    : m_client(client)
+{
+}
+
+AsyncFileWriterChromium::~AsyncFileWriterChromium()
+{
+}
+
+void AsyncFileWriterChromium::setWebFileWriter(PassOwnPtr<WebKit::WebFileWriter> writer)
+{
+    m_writer = writer;
+}
+
+void AsyncFileWriterChromium::write(long long position, Blob* data)
+{
+    ASSERT(m_writer);
+    m_writer->write(position, WebKit::WebURL(data->url()));
+}
+
+void AsyncFileWriterChromium::truncate(long long length)
+{
+    ASSERT(m_writer);
+    m_writer->truncate(length);
+}
+
+void AsyncFileWriterChromium::abort()
+{
+    ASSERT(m_writer);
+    m_writer->cancel();
+}
+
+void AsyncFileWriterChromium::didWrite(long long bytes, bool complete)
+{
+    ASSERT(m_writer);
+    m_client->didWrite(bytes, complete);
+}
+
+void AsyncFileWriterChromium::didTruncate()
+{
+    m_client->didTruncate();
+}
+
+void AsyncFileWriterChromium::didFail(WebKit::WebFileError error)
+{
+    m_client->didFail(static_cast<FileError::ErrorCode>(error));
+}
+
+} // namespace
+
+#endif // ENABLE(FILE_SYSTEM)