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diff --git a/WebCore/platform/AsyncFileSystemCallbacks.h b/WebCore/platform/AsyncFileSystemCallbacks.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 AsyncFileSystemCallbacks_h
+#define AsyncFileSystemCallbacks_h
+
+#if ENABLE(FILE_SYSTEM)
+
+#include "PlatformString.h"
+
+namespace WebCore {
+
+class AsyncFileSystem;
+
+class AsyncFileSystemCallbacks : public Noncopyable {
+public:
+    // Called when a requested operation is completed successfully.
+    virtual void didSucceed() = 0;
+
+    // Called when a requested file system is opened.
+    virtual void didOpenFileSystem(const String& name, PassOwnPtr<AsyncFileSystem>) = 0;
+
+    // Called when a file metadata is read successfully.
+    virtual void didReadMetadata(double modificationTime) = 0;
+
+    // Called when a directory entry is read.
+    virtual void didReadDirectoryEntry(const String& name, bool isDirectory) = 0;
+
+    // Called after a chunk of directory entries have been read (i.e. indicates it's good time to call back to the application).  If hasMore is true there can be more chunks.
+    virtual void didReadDirectoryEntries(bool hasMore) = 0;
+
+    // Called when there was an error.
+    virtual void didFail(int code) = 0;
+
+    virtual ~AsyncFileSystemCallbacks() { }
+};
+
+} // namespace
+
+#endif // ENABLE(FILE_SYSTEM)
+
+#endif // AsyncFileSystemCallbacks_h