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diff --git a/WebCore/platform/AsyncFileSystem.h b/WebCore/platform/AsyncFileSystem.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 AsyncFileSystem_h
+#define AsyncFileSystem_h
+
+#if ENABLE(FILE_SYSTEM)
+
+#include "PlatformString.h"
+#include "Timer.h"
+#include <wtf/PassOwnPtr.h>
+
+namespace WebCore {
+
+class AsyncFileSystem;
+class AsyncFileSystemCallbacks;
+
+// This class provides async interface for platform-specific file system implementation.  Note that all the methods take platform paths.
+class AsyncFileSystem : public Noncopyable {
+public:
+    virtual ~AsyncFileSystem() { }
+
+    // FileSystem type
+    enum Type {
+        Temporary,
+        Persistent,
+    };
+
+    virtual void stop() { }
+    virtual bool hasPendingActivity() { return false; }
+
+    // Creates and returns a new platform-specific AsyncFileSystem instance if the platform has its own implementation.
+    static PassOwnPtr<AsyncFileSystem> create(const String& rootPath);
+
+    // Opens a new file system.
+    static void openFileSystem(const String& basePath, const String& storageIdentifier, Type, PassOwnPtr<AsyncFileSystemCallbacks>);
+
+    // Moves a file or directory from srcPath to destPath.
+    // AsyncFileSystemCallbacks::didSucceed() is called when the operation is completed successfully.
+    // AsyncFileSystemCallbacks::didFail() is called otherwise.
+    virtual void move(const String& srcPath, const String& destPath, PassOwnPtr<AsyncFileSystemCallbacks>) = 0;
+
+    // Copies a file or directory from srcPath to destPath.
+    // AsyncFileSystemCallbacks::didSucceed() is called when the operation is completed successfully.
+    // AsyncFileSystemCallbacks::didFail() is called otherwise.
+    virtual void copy(const String& srcPath, const String& destPath, PassOwnPtr<AsyncFileSystemCallbacks>) = 0;
+
+    // Deletes a file or directory at a given path.
+    // AsyncFileSystemCallbacks::didSucceed() is called when the operation is completed successfully.
+    // AsyncFileSystemCallbacks::didFail() is called otherwise.
+    virtual void remove(const String& path, PassOwnPtr<AsyncFileSystemCallbacks>) = 0;
+
+    // Retrieves the metadata information of the file or directory at a given path.
+    // AsyncFileSystemCallbacks::didReadMetadata() is called when the operation is completed successfully.
+    // AsyncFileSystemCallbacks::didFail() is called otherwise.
+    virtual void readMetadata(const String& path, PassOwnPtr<AsyncFileSystemCallbacks>) = 0;
+
+    // Creates a file at a given path.  If exclusive flag is true, it fails if the path already exists.
+    // AsyncFileSystemCallbacks::didSucceed() is called when the operation is completed successfully.
+    // AsyncFileSystemCallbacks::didFail() is called otherwise.
+    virtual void createFile(const String& path, bool exclusive, PassOwnPtr<AsyncFileSystemCallbacks>) = 0;
+
+    // Creates a directory at a given path.  If exclusive flag is true, it fails if the path already exists.
+    // AsyncFileSystemCallbacks::didSucceed() is called when the operation is completed successfully.
+    // AsyncFileSystemCallbacks::didFail() is called otherwise.
+    virtual void createDirectory(const String& path, bool exclusive, PassOwnPtr<AsyncFileSystemCallbacks>) = 0;
+
+    // Checks if a file exists at a given path.
+    // AsyncFileSystemCallbacks::didSucceed() is called if the file exists.
+    // AsyncFileSystemCallbacks::didFail() is called otherwise.
+    virtual void fileExists(const String& path, PassOwnPtr<AsyncFileSystemCallbacks>) = 0;
+
+    // Checks if a directory exists at a given path.
+    // AsyncFileSystemCallbacks::didSucceed() is called if the directory exists.
+    // AsyncFileSystemCallbacks::didFail() is called otherwise.
+    virtual void directoryExists(const String& path, PassOwnPtr<AsyncFileSystemCallbacks>) = 0;
+
+    // Reads directory entries of a given directory at path.
+    // AsyncFileSystemCallbacks::didReadDirectoryEntry() is called when each directory entry is called. AsyncFileSystemCallbacks::didReadDirectoryEntries() is called after a chunk of directory entries have been read.
+    // AsyncFileSystemCallbacks::didFail() is when there is an error.
+    virtual void readDirectory(const String& path, PassOwnPtr<AsyncFileSystemCallbacks>) = 0;
+
+    // Converts a given absolute virtual path to a platform path that starts with the platform root path of this file system.
+    virtual String virtualToPlatformPath(const String& path) const;
+
+protected:
+    AsyncFileSystem(const String& platformRootPath)
+        : m_platformRootPath(platformRootPath)
+    {
+    }
+
+    String m_platformRootPath;
+};
+
+} // namespace WebCore
+
+#endif // ENABLE(FILE_SYSTEM)
+
+#endif // AsyncFileSystem_h