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diff --git a/WebKit/chromium/src/WebWorkerBase.h b/WebKit/chromium/src/WebWorkerBase.h
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+/*
+ * Copyright (C) 2009 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 WebWorkerBase_h
+#define WebWorkerBase_h
+
+#if ENABLE(WORKERS)
+
+#include "ScriptExecutionContext.h"
+#include "WorkerLoaderProxy.h"
+#include "WorkerObjectProxy.h"
+#include <wtf/PassOwnPtr.h>
+#include <wtf/RefPtr.h>
+
+namespace WebCore {
+class WorkerThread;
+}
+
+namespace WebKit {
+class WebCommonWorkerClient;
+class WebURL;
+class WebView;
+class WebWorkerClient;
+
+// Base class for WebSharedWorkerImpl and WebWorkerImpl. It contains common
+// code used by both implementation classes, including implementations of the
+// WorkerObjectProxy and WorkerLoaderProxy interfaces.
+class WebWorkerBase : public WebCore::WorkerObjectProxy
+                    , public WebCore::WorkerLoaderProxy {
+public:
+    WebWorkerBase();
+    virtual ~WebWorkerBase();
+
+    // WebCore::WorkerObjectProxy methods:
+    virtual void postMessageToWorkerObject(
+        PassRefPtr<WebCore::SerializedScriptValue>,
+        PassOwnPtr<WebCore::MessagePortChannelArray>);
+    virtual void postExceptionToWorkerObject(
+        const WebCore::String&, int, const WebCore::String&);
+    virtual void postConsoleMessageToWorkerObject(
+        WebCore::MessageDestination, WebCore::MessageSource, WebCore::MessageType,
+        WebCore::MessageLevel, const WebCore::String&, int, const WebCore::String&);
+    virtual void confirmMessageFromWorkerObject(bool);
+    virtual void reportPendingActivity(bool);
+    virtual void workerContextClosed();
+    virtual void workerContextDestroyed();
+
+    // WebCore::WorkerLoaderProxy methods:
+    virtual void postTaskToLoader(PassOwnPtr<WebCore::ScriptExecutionContext::Task>);
+    virtual void postTaskForModeToWorkerContext(
+        PassOwnPtr<WebCore::ScriptExecutionContext::Task>, const WebCore::String& mode);
+
+    // Executes the given task on the main thread.
+    static void dispatchTaskToMainThread(PassOwnPtr<WebCore::ScriptExecutionContext::Task>);
+
+protected:
+    virtual WebWorkerClient* client() = 0;
+    virtual WebCommonWorkerClient* commonClient() = 0;
+
+    void setWorkerThread(PassRefPtr<WebCore::WorkerThread> thread) { m_workerThread = thread; }
+    WebCore::WorkerThread* workerThread() { return m_workerThread.get(); }
+
+    // Shuts down the worker thread.
+    void stopWorkerThread();
+
+    // Creates the shadow loader used for worker network requests.
+    void initializeLoader(const WebURL&);
+
+private:
+    // Function used to invoke tasks on the main thread.
+    static void invokeTaskMethod(void*);
+
+    // Tasks that are run on the main thread.
+    static void postMessageTask(
+        WebCore::ScriptExecutionContext* context,
+        WebWorkerBase* thisPtr,
+        WebCore::String message,
+        PassOwnPtr<WebCore::MessagePortChannelArray> channels);
+    static void postExceptionTask(
+        WebCore::ScriptExecutionContext* context,
+        WebWorkerBase* thisPtr,
+        const WebCore::String& message,
+        int lineNumber,
+        const WebCore::String& sourceURL);
+    static void postConsoleMessageTask(
+        WebCore::ScriptExecutionContext* context,
+        WebWorkerBase* thisPtr,
+        int destination,
+        int source,
+        int type,
+        int level,
+        const WebCore::String& message,
+        int lineNumber,
+        const WebCore::String& sourceURL);
+    static void confirmMessageTask(
+        WebCore::ScriptExecutionContext* context,
+        WebWorkerBase* thisPtr,
+        bool hasPendingActivity);
+    static void reportPendingActivityTask(
+        WebCore::ScriptExecutionContext* context,
+        WebWorkerBase* thisPtr,
+        bool hasPendingActivity);
+    static void workerContextClosedTask(
+        WebCore::ScriptExecutionContext* context,
+        WebWorkerBase* thisPtr);
+    static void workerContextDestroyedTask(
+        WebCore::ScriptExecutionContext* context,
+        WebWorkerBase* thisPtr);
+
+    // 'shadow page' - created to proxy loading requests from the worker.
+    RefPtr<WebCore::ScriptExecutionContext> m_loadingDocument;
+    WebView* m_webView;
+    bool m_askedToTerminate;
+
+    RefPtr<WebCore::WorkerThread> m_workerThread;
+};
+
+} // namespace WebKit
+
+#endif // ENABLE(WORKERS)
+
+#endif