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diff --git a/chromium/third_party/WebKit/Source/web/WorkerAsyncFileSystemChromium.cpp b/chromium/third_party/WebKit/Source/web/WorkerAsyncFileSystemChromium.cpp
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+++ b/chromium/third_party/WebKit/Source/web/WorkerAsyncFileSystemChromium.cpp
@@ -0,0 +1,194 @@
+/*
+ * 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 "WorkerAsyncFileSystemChromium.h"
+
+#include "WebFileSystemCallbacksImpl.h"
+#include "WebFileWriter.h"
+#include "WorkerAsyncFileWriterChromium.h"
+#include "WorkerFileSystemCallbacksBridge.h"
+#include "bindings/v8/WorkerScriptController.h"
+#include "core/fileapi/BlobURL.h"
+#include "core/platform/AsyncFileSystemCallbacks.h"
+#include "core/platform/FileMetadata.h"
+#include "core/platform/FileSystem.h"
+#include "core/platform/NotImplemented.h"
+#include "core/workers/WorkerGlobalScope.h"
+#include "core/workers/WorkerThread.h"
+#include "public/platform/WebFileSystem.h"
+#include "wtf/text/CString.h"
+
+using namespace WebKit;
+
+namespace WebCore {
+
+static const char fileSystemOperationsMode[] = "fileSystemOperationsMode";
+
+WorkerAsyncFileSystemChromium::WorkerAsyncFileSystemChromium(ScriptExecutionContext* context, FileSystemSynchronousType synchronousType)
+    : m_scriptExecutionContext(context)
+    , m_workerGlobalScope(toWorkerGlobalScope(context))
+    , m_synchronousType(synchronousType)
+{
+    ASSERT(m_scriptExecutionContext->isWorkerGlobalScope());
+
+    m_workerLoaderProxy = &m_workerGlobalScope->thread()->workerLoaderProxy();
+}
+
+WorkerAsyncFileSystemChromium::~WorkerAsyncFileSystemChromium()
+{
+}
+
+bool WorkerAsyncFileSystemChromium::waitForOperationToComplete()
+{
+    if (!m_bridgeForCurrentOperation)
+        return false;
+
+    RefPtr<WorkerFileSystemCallbacksBridge> bridge = m_bridgeForCurrentOperation.release();
+    if (m_workerGlobalScope->thread()->runLoop().runInMode(m_workerGlobalScope, m_modeForCurrentOperation) == MessageQueueTerminated) {
+        bridge->stop();
+        return false;
+    }
+    return true;
+}
+
+void WorkerAsyncFileSystemChromium::move(const KURL& sourcePath, const KURL& destinationPath, PassOwnPtr<AsyncFileSystemCallbacks> callbacks)
+{
+    createWorkerFileSystemCallbacksBridge(callbacks)->postMoveToMainThread(m_webFileSystem, sourcePath, destinationPath, m_modeForCurrentOperation);
+}
+
+void WorkerAsyncFileSystemChromium::copy(const KURL& sourcePath, const KURL& destinationPath, PassOwnPtr<AsyncFileSystemCallbacks> callbacks)
+{
+    createWorkerFileSystemCallbacksBridge(callbacks)->postCopyToMainThread(m_webFileSystem, sourcePath, destinationPath, m_modeForCurrentOperation);
+}
+
+void WorkerAsyncFileSystemChromium::remove(const KURL& path, PassOwnPtr<AsyncFileSystemCallbacks> callbacks)
+{
+    createWorkerFileSystemCallbacksBridge(callbacks)->postRemoveToMainThread(m_webFileSystem, path, m_modeForCurrentOperation);
+}
+
+void WorkerAsyncFileSystemChromium::removeRecursively(const KURL& path, PassOwnPtr<AsyncFileSystemCallbacks> callbacks)
+{
+    createWorkerFileSystemCallbacksBridge(callbacks)->postRemoveRecursivelyToMainThread(m_webFileSystem, path, m_modeForCurrentOperation);
+}
+
+void WorkerAsyncFileSystemChromium::readMetadata(const KURL& path, PassOwnPtr<AsyncFileSystemCallbacks> callbacks)
+{
+    createWorkerFileSystemCallbacksBridge(callbacks)->postReadMetadataToMainThread(m_webFileSystem, path, m_modeForCurrentOperation);
+}
+
+void WorkerAsyncFileSystemChromium::createFile(const KURL& path, bool exclusive, PassOwnPtr<AsyncFileSystemCallbacks> callbacks)
+{
+    createWorkerFileSystemCallbacksBridge(callbacks)->postCreateFileToMainThread(m_webFileSystem, path, exclusive, m_modeForCurrentOperation);
+}
+
+void WorkerAsyncFileSystemChromium::createDirectory(const KURL& path, bool exclusive, PassOwnPtr<AsyncFileSystemCallbacks> callbacks)
+{
+    createWorkerFileSystemCallbacksBridge(callbacks)->postCreateDirectoryToMainThread(m_webFileSystem, path, exclusive, m_modeForCurrentOperation);
+}
+
+void WorkerAsyncFileSystemChromium::fileExists(const KURL& path, PassOwnPtr<AsyncFileSystemCallbacks> callbacks)
+{
+    createWorkerFileSystemCallbacksBridge(callbacks)->postFileExistsToMainThread(m_webFileSystem, path, m_modeForCurrentOperation);
+}
+
+void WorkerAsyncFileSystemChromium::directoryExists(const KURL& path, PassOwnPtr<AsyncFileSystemCallbacks> callbacks)
+{
+    createWorkerFileSystemCallbacksBridge(callbacks)->postDirectoryExistsToMainThread(m_webFileSystem, path, m_modeForCurrentOperation);
+}
+
+void WorkerAsyncFileSystemChromium::readDirectory(const KURL& path, PassOwnPtr<AsyncFileSystemCallbacks> callbacks)
+{
+    createWorkerFileSystemCallbacksBridge(callbacks)->postReadDirectoryToMainThread(m_webFileSystem, path, m_modeForCurrentOperation);
+}
+
+class WorkerFileWriterHelperCallbacks : public AsyncFileSystemCallbacks {
+public:
+    static PassOwnPtr<WorkerFileWriterHelperCallbacks> create(AsyncFileWriterClient* client, const WebURL& path, WebKit::WebFileSystem* webFileSystem, PassOwnPtr<WebCore::AsyncFileSystemCallbacks> callbacks, WorkerGlobalScope* workerGlobalScope)
+    {
+        return adoptPtr(new WorkerFileWriterHelperCallbacks(client, path, webFileSystem, callbacks, workerGlobalScope));
+    }
+
+    virtual void didReadMetadata(const FileMetadata& metadata)
+    {
+        ASSERT(m_callbacks);
+        if (metadata.type != FileMetadata::TypeFile || metadata.length < 0)
+            m_callbacks->didFail(WebKit::WebFileErrorInvalidState);
+        else {
+            OwnPtr<WorkerAsyncFileWriterChromium> asyncFileWriterChromium = WorkerAsyncFileWriterChromium::create(m_webFileSystem, m_path, m_workerGlobalScope, m_client, WorkerAsyncFileWriterChromium::Asynchronous);
+            m_callbacks->didCreateFileWriter(asyncFileWriterChromium.release(), metadata.length);
+        }
+    }
+
+    virtual void didFail(int code)
+    {
+        ASSERT(m_callbacks);
+        m_callbacks->didFail(code);
+    }
+
+private:
+    WorkerFileWriterHelperCallbacks(AsyncFileWriterClient* client, const WebURL& path, WebKit::WebFileSystem* webFileSystem, PassOwnPtr<WebCore::AsyncFileSystemCallbacks> callbacks, WorkerGlobalScope* workerGlobalScope)
+        : m_client(client)
+        , m_path(path)
+        , m_webFileSystem(webFileSystem)
+        , m_callbacks(callbacks)
+        , m_workerGlobalScope(workerGlobalScope)
+    {
+    }
+
+    AsyncFileWriterClient* m_client;
+    WebURL m_path;
+    WebKit::WebFileSystem* m_webFileSystem;
+    OwnPtr<WebCore::AsyncFileSystemCallbacks> m_callbacks;
+    WorkerGlobalScope* m_workerGlobalScope;
+};
+
+void WorkerAsyncFileSystemChromium::createWriter(AsyncFileWriterClient* client, const KURL& path, PassOwnPtr<AsyncFileSystemCallbacks> callbacks)
+{
+    createWorkerFileSystemCallbacksBridge(WorkerFileWriterHelperCallbacks::create(client, path, m_webFileSystem, callbacks, m_workerGlobalScope))->postReadMetadataToMainThread(m_webFileSystem, path, m_modeForCurrentOperation);
+}
+
+void WorkerAsyncFileSystemChromium::createSnapshotFileAndReadMetadata(const KURL& path, PassOwnPtr<AsyncFileSystemCallbacks> callbacks)
+{
+    createWorkerFileSystemCallbacksBridge(callbacks)->postCreateSnapshotFileToMainThread(m_webFileSystem, path, m_modeForCurrentOperation);
+}
+
+PassRefPtr<WorkerFileSystemCallbacksBridge> WorkerAsyncFileSystemChromium::createWorkerFileSystemCallbacksBridge(PassOwnPtr<AsyncFileSystemCallbacks> callbacks)
+{
+    ASSERT_UNUSED(m_synchronousType, m_synchronousType == AsynchronousFileSystem || !m_bridgeForCurrentOperation);
+
+    m_modeForCurrentOperation = fileSystemOperationsMode;
+    m_modeForCurrentOperation.append(String::number(m_workerGlobalScope->thread()->runLoop().createUniqueId()));
+
+    m_bridgeForCurrentOperation = WorkerFileSystemCallbacksBridge::create(m_workerLoaderProxy, m_scriptExecutionContext, new WebKit::WebFileSystemCallbacksImpl(callbacks));
+    return m_bridgeForCurrentOperation;
+}
+
+} // namespace WebCore