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diff --git a/WebCore/storage/FileSystemCallbacks.h b/WebCore/storage/FileSystemCallbacks.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 FileSystemCallbacks_h
+#define FileSystemCallbacks_h
+
+#if ENABLE(FILE_SYSTEM)
+
+#include "PlatformString.h"
+#include <wtf/PassRefPtr.h>
+#include <wtf/Vector.h>
+
+namespace WebCore {
+
+class DOMFileSystem;
+class ErrorCallback;
+class EntriesCallback;
+class EntryArray;
+class EntryCallback;
+class FileSystemCallback;
+class MetadataCallback;
+class ScriptExecutionContext;
+class VoidCallback;
+
+typedef int ExceptionCode;
+
+// A base class for FileSystem callbacks that bundles successCallback, errorCallback and some closure data for the callbacks.
+class FileSystemCallbacksBase : public Noncopyable {
+public:
+    virtual ~FileSystemCallbacksBase();
+
+    // For EntryCallbacks and VoidCallbacks.
+    virtual void didSucceed();
+
+    // For FileSystemCallbacks.
+    virtual void didOpenFileSystem(const String& name, const String& rootPath);
+
+    // For MetadataCallbacks.
+    virtual void didReadMetadata(double modificationTime);
+
+    // For EntriesCallbacks. didReadDirectoryEntry is called each time the API reads an entry, and didReadDirectoryDone is called when a chunk of entries have been read (i.e. good time to call back to the application).  If hasMore is true there can be more chunks.
+    virtual void didReadDirectoryEntry(const String& name, bool isDirectory);
+    virtual void didReadDirectoryChunkDone(bool hasMore);
+
+    // For ErrorCallback.
+    virtual void didFail(ExceptionCode code);
+
+protected:
+    FileSystemCallbacksBase(PassRefPtr<ErrorCallback> errorCallback);
+    RefPtr<ErrorCallback> m_errorCallback;
+};
+
+// Subclasses ----------------------------------------------------------------
+
+class EntryCallbacks : public FileSystemCallbacksBase {
+public:
+    EntryCallbacks(PassRefPtr<EntryCallback>, PassRefPtr<ErrorCallback>, DOMFileSystem*, const String& expectedPath, bool isDirectory);
+    virtual void didSucceed();
+
+private:
+    RefPtr<EntryCallback> m_successCallback;
+    DOMFileSystem* m_fileSystem;
+    String m_expectedPath;
+    bool m_isDirectory;
+};
+
+class EntriesCallbacks : public FileSystemCallbacksBase {
+public:
+    EntriesCallbacks(PassRefPtr<EntriesCallback>, PassRefPtr<ErrorCallback>, DOMFileSystem*, const String& basePath);
+    virtual void didReadDirectoryEntry(const String& name, bool isDirectory);
+    virtual void didReadDirectoryChunkDone(bool hasMore);
+
+private:
+    RefPtr<EntriesCallback> m_successCallback;
+    DOMFileSystem* m_fileSystem;
+    String m_basePath;
+    RefPtr<EntryArray> m_entries;
+};
+
+class FileSystemCallbacks : public FileSystemCallbacksBase {
+public:
+    FileSystemCallbacks(PassRefPtr<FileSystemCallback>, PassRefPtr<ErrorCallback>);
+    virtual void didOpenFileSystem(const String& name, const String& rootPath);
+
+private:
+    RefPtr<FileSystemCallback> m_successCallback;
+};
+
+class MetadataCallbacks : public FileSystemCallbacksBase {
+public:
+    MetadataCallbacks(PassRefPtr<MetadataCallback>, PassRefPtr<ErrorCallback>);
+    virtual void didReadMetadata(double modificationTime);
+
+private:
+    RefPtr<MetadataCallback> m_successCallback;
+};
+
+class VoidCallbacks : public FileSystemCallbacksBase {
+public:
+    VoidCallbacks(PassRefPtr<VoidCallback>, PassRefPtr<ErrorCallback>);
+    virtual void didSucceed();
+
+private:
+    RefPtr<VoidCallback> m_successCallback;
+};
+
+} // namespace
+
+#endif // ENABLE(FILE_SYSTEM)
+
+#endif // FileSystemCallbacks_h