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diff --git a/WebKit/chromium/src/WorkerFileSystemCallbacksBridge.h b/WebKit/chromium/src/WorkerFileSystemCallbacksBridge.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 WorkerFileSystemCallbacksBridge_h
+#define WorkerFileSystemCallbacksBridge_h
+
+#if ENABLE(FILE_SYSTEM)
+
+#include "PlatformString.h"
+#include "ScriptExecutionContext.h"
+#include "WebFileError.h"
+#include "WebFileSystem.h"
+#include "WebVector.h"
+#include "WorkerContext.h"
+#include <wtf/PassOwnPtr.h>
+#include <wtf/PassRefPtr.h>
+#include <wtf/Threading.h>
+
+namespace WebKit {
+
+class AsyncFileSystem;
+class MainThreadFileSystemCallbacks;
+class ThreadableCallbacksBridgeWrapper;
+class WebCommonWorkerClient;
+class WebFileSystemCallbacks;
+class WebWorkerBase;
+struct WebFileInfo;
+struct WebFileSystemEntry;
+
+// This class is used to post a openFileSystem request to the main thread and get called back for the request. This must be destructed on the worker thread.
+//
+// A typical flow for openFileSystem would look like this:
+// Bridge::postOpenFileSystemToMainThread() on WorkerThread
+//  --> Bridge::openFileSystemOnMainThread() is called on MainThread
+//      This makes an IPC with a MainThreadFileSystemCallbacks instance
+//     [actual operation is down in the browser]
+//  --> MainThreadFileSystemCallbacks::didXxx is called on MainThread
+//  --> Bridge::didXxxOnMainThread is called on MainThread
+//  --> Bridge::didXxxOnWorkerThread is called on WorkerThread
+//      This calls the original callbacks (m_callbacksOnWorkerThread) and
+//      releases a self-reference to the bridge.
+class WorkerFileSystemCallbacksBridge : public ThreadSafeShared<WorkerFileSystemCallbacksBridge>, public WebCore::WorkerContext::Observer {
+public:
+    ~WorkerFileSystemCallbacksBridge();
+
+    // WorkerContext::Observer method.
+    virtual void notifyStop()
+    {
+        stop();
+    }
+
+    void stop();
+
+    static PassRefPtr<WorkerFileSystemCallbacksBridge> create(WebWorkerBase* worker, WebCore::ScriptExecutionContext* workerContext, WebFileSystemCallbacks* callbacks)
+    {
+        return adoptRef(new WorkerFileSystemCallbacksBridge(worker, workerContext, callbacks));
+    }
+
+    // Methods that create an instance and post an initial request task to the main thread. They must be called on the worker thread.
+    void postOpenFileSystemToMainThread(WebCommonWorkerClient*, WebFileSystem::Type, long long size, const String& mode);
+    void postMoveToMainThread(WebFileSystem*, const String& srcPath, const String& destPath, const String& mode);
+    void postCopyToMainThread(WebFileSystem*, const String& srcPath, const String& destPath, const String& mode);
+    void postRemoveToMainThread(WebFileSystem*, const String& path, const String& mode);
+    void postRemoveRecursivelyToMainThread(WebFileSystem*, const String& path, const String& mode);
+    void postReadMetadataToMainThread(WebFileSystem*, const String& path, const String& mode);
+    void postCreateFileToMainThread(WebFileSystem*, const String& path, bool exclusive, const String& mode);
+    void postCreateDirectoryToMainThread(WebFileSystem*, const String& path, bool exclusive, const String& mode);
+    void postFileExistsToMainThread(WebFileSystem*, const String& path, const String& mode);
+    void postDirectoryExistsToMainThread(WebFileSystem*, const String& path, const String& mode);
+    void postReadDirectoryToMainThread(WebFileSystem*, const String& path, const String& mode);
+
+    // Callback methods that are called on the main thread.
+    void didFailOnMainThread(WebFileError, const String& mode);
+    void didOpenFileSystemOnMainThread(const String& name, const String& rootPath, const String& mode);
+    void didSucceedOnMainThread(const String& mode);
+    void didReadMetadataOnMainThread(const WebFileInfo&, const String& mode);
+    void didReadDirectoryOnMainThread(const WebVector<WebFileSystemEntry>&, bool hasMore, const String& mode);
+
+private:
+    WorkerFileSystemCallbacksBridge(WebWorkerBase*, WebCore::ScriptExecutionContext*, WebFileSystemCallbacks*);
+
+    // Methods that are to be called on the main thread.
+    static void openFileSystemOnMainThread(WebCore::ScriptExecutionContext*, WebCommonWorkerClient*, WebFileSystem::Type, long long size, WorkerFileSystemCallbacksBridge*, const String& mode);
+    static void moveOnMainThread(WebCore::ScriptExecutionContext*, WebFileSystem*, const String& srcPath, const String& destPath, WorkerFileSystemCallbacksBridge*, const String& mode);
+    static void copyOnMainThread(WebCore::ScriptExecutionContext*, WebFileSystem*, const String& srcPath, const String& destPath, WorkerFileSystemCallbacksBridge*, const String& mode);
+    static void removeOnMainThread(WebCore::ScriptExecutionContext*, WebFileSystem*, const String& path, WorkerFileSystemCallbacksBridge*, const String& mode);
+    static void removeRecursivelyOnMainThread(WebCore::ScriptExecutionContext*, WebFileSystem*, const String& path, WorkerFileSystemCallbacksBridge*, const String& mode);
+    static void readMetadataOnMainThread(WebCore::ScriptExecutionContext*, WebFileSystem*, const String& path, WorkerFileSystemCallbacksBridge*, const String& mode);
+    static void createFileOnMainThread(WebCore::ScriptExecutionContext*, WebFileSystem*, const String& path, bool exclusive, WorkerFileSystemCallbacksBridge*, const String& mode);
+    static void createDirectoryOnMainThread(WebCore::ScriptExecutionContext*, WebFileSystem*, const String& path, bool exclusive, WorkerFileSystemCallbacksBridge*, const String& mode);
+    static void fileExistsOnMainThread(WebCore::ScriptExecutionContext*, WebFileSystem*, const String& path, WorkerFileSystemCallbacksBridge*, const String& mode);
+    static void directoryExistsOnMainThread(WebCore::ScriptExecutionContext*, WebFileSystem*, const String& path, WorkerFileSystemCallbacksBridge*, const String& mode);
+    static void readDirectoryOnMainThread(WebCore::ScriptExecutionContext*, WebFileSystem*, const String& path, WorkerFileSystemCallbacksBridge*, const String& mode);
+
+    friend class MainThreadFileSystemCallbacks;
+
+    // Methods that dispatch WebFileSystemCallbacks on the worker threads.
+    // They release a selfRef of the WorkerFileSystemCallbacksBridge.
+    static void didFailOnWorkerThread(WebCore::ScriptExecutionContext*, WorkerFileSystemCallbacksBridge*, WebFileError);
+    static void didOpenFileSystemOnWorkerThread(WebCore::ScriptExecutionContext*, WorkerFileSystemCallbacksBridge*, const String& name, const String& rootPath);
+    static void didSucceedOnWorkerThread(WebCore::ScriptExecutionContext*, WorkerFileSystemCallbacksBridge*);
+    static void didReadMetadataOnWorkerThread(WebCore::ScriptExecutionContext*, WorkerFileSystemCallbacksBridge*, const WebFileInfo&);
+    static void didReadDirectoryOnWorkerThread(WebCore::ScriptExecutionContext*, WorkerFileSystemCallbacksBridge*, const WebVector<WebFileSystemEntry>&, bool hasMore);
+
+    // For early-exist; this deref's selfRef and returns true if the worker is already null.
+    bool derefIfWorkerIsStopped();
+
+    static void runTaskOnMainThread(WebCore::ScriptExecutionContext*, WorkerFileSystemCallbacksBridge*, PassOwnPtr<WebCore::ScriptExecutionContext::Task>);
+    static void runTaskOnWorkerThread(WebCore::ScriptExecutionContext*, PassRefPtr<WorkerFileSystemCallbacksBridge>, PassOwnPtr<WebCore::ScriptExecutionContext::Task>);
+
+    void dispatchTaskToMainThread(PassOwnPtr<WebCore::ScriptExecutionContext::Task>);
+    void mayPostTaskToWorker(PassOwnPtr<WebCore::ScriptExecutionContext::Task>, const String& mode);
+
+    // m_selfRef keeps a reference to itself until a task is created for the worker thread (at which point the task holds the reference).
+    RefPtr<WorkerFileSystemCallbacksBridge> m_selfRef;
+
+    Mutex m_mutex;
+    WebWorkerBase* m_worker;
+    WebCore::ScriptExecutionContext* m_workerContext;
+
+    // This is self-destructed and must be fired on the worker thread.
+    WebFileSystemCallbacks* m_callbacksOnWorkerThread;
+};
+
+} // namespace WebCore
+
+#endif
+
+#endif // WorkerFileSystemCallbacksBridge_h