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diff --git a/WebCore/loader/WorkerThreadableLoader.cpp b/WebCore/loader/WorkerThreadableLoader.cpp
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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.
+ */
+
+#include "config.h"
+
+#if ENABLE(WORKERS)
+
+#include "WorkerThreadableLoader.h"
+
+#include "GenericWorkerTask.h"
+#include "ResourceError.h"
+#include "ResourceRequest.h"
+#include "ResourceResponse.h"
+#include "ThreadableLoader.h"
+#include "WorkerContext.h"
+#include "WorkerMessagingProxy.h"
+#include "WorkerThread.h"
+#include <memory>
+#include <wtf/OwnPtr.h>
+#include <wtf/Threading.h>
+#include <wtf/Vector.h>
+
+using namespace std;
+
+namespace WebCore {
+
+static const char loadResourceSynchronouslyMode[] = "loadResourceSynchronouslyMode";
+
+// FIXME: The assumption that we can upcast worker object proxy to WorkerMessagingProxy will not be true in multi-process implementation.
+WorkerThreadableLoader::WorkerThreadableLoader(WorkerContext* workerContext, ThreadableLoaderClient* client, const String& taskMode, const ResourceRequest& request, LoadCallbacks callbacksSetting,
+                                               ContentSniff contentSniff)
+    : m_workerContext(workerContext)
+    , m_workerClientWrapper(ThreadableLoaderClientWrapper::create(client))
+    , m_bridge(*(new MainThreadBridge(m_workerClientWrapper, *(static_cast<WorkerMessagingProxy*>(m_workerContext->thread()->workerObjectProxy())), taskMode, request, callbacksSetting,
+                                      contentSniff)))
+{
+}
+
+WorkerThreadableLoader::~WorkerThreadableLoader()
+{
+    m_bridge.destroy();
+}
+
+void WorkerThreadableLoader::loadResourceSynchronously(WorkerContext* workerContext, const ResourceRequest& request, ThreadableLoaderClient& client)
+{
+    WorkerRunLoop& runLoop = workerContext->thread()->runLoop();
+
+    // Create a unique mode just for this synchronous resource load.
+    String mode = loadResourceSynchronouslyMode;
+    mode.append(String::number(runLoop.createUniqueId()));
+
+    ContentSniff contentSniff = request.url().isLocalFile() ? SniffContent : DoNotSniffContent;
+    RefPtr<WorkerThreadableLoader> loader = WorkerThreadableLoader::create(workerContext, &client, mode, request, DoNotSendLoadCallbacks, contentSniff);
+
+    MessageQueueWaitResult result = MessageQueueMessageReceived;
+    while (!loader->done() && result != MessageQueueTerminated)
+        result = runLoop.runInMode(workerContext, mode);
+
+    if (!loader->done() && result == MessageQueueTerminated)
+        loader->cancel();
+}
+
+void WorkerThreadableLoader::cancel()
+{
+    m_bridge.cancel();
+}
+
+WorkerThreadableLoader::MainThreadBridge::MainThreadBridge(PassRefPtr<ThreadableLoaderClientWrapper> workerClientWrapper, WorkerMessagingProxy& messagingProxy, const String& taskMode,
+                                                           const ResourceRequest& request, LoadCallbacks callbacksSetting, ContentSniff contentSniff)
+    : m_workerClientWrapper(workerClientWrapper)
+    , m_messagingProxy(messagingProxy)
+    , m_taskMode(taskMode.copy())
+{
+    ASSERT(m_workerClientWrapper.get());
+    m_messagingProxy.postTaskToWorkerObject(createCallbackTask(&MainThreadBridge::mainThreadCreateLoader, this, request, callbacksSetting, contentSniff));
+}
+
+WorkerThreadableLoader::MainThreadBridge::~MainThreadBridge()
+{
+}
+
+void WorkerThreadableLoader::MainThreadBridge::mainThreadCreateLoader(ScriptExecutionContext* context, MainThreadBridge* thisPtr, auto_ptr<CrossThreadResourceRequestData> requestData, LoadCallbacks callbacksSetting, ContentSniff contentSniff)
+{
+    // FIXME: This assert fails for nested workers.  Removing the assert would allow it to work,
+    // but then there would be one WorkerThreadableLoader in every intermediate worker simply
+    // chaining the requests, which is not very good. Instead, the postTaskToWorkerObject should be a
+    // postTaskToDocumentContext.
+    ASSERT(isMainThread());
+    ASSERT(context->isDocument());
+
+    if (thisPtr->m_messagingProxy.askedToTerminate())
+        return;
+
+    // FIXME: the created loader has no knowledge of the origin of the worker doing the load request.
+    // Basically every setting done in SubresourceLoader::create (including the contents of addExtraFieldsToRequest)
+    // needs to be examined for how it should take into account a different originator.
+    OwnPtr<ResourceRequest> request(ResourceRequest::adopt(requestData));
+    // FIXME: If the a site requests a local resource, then this will return a non-zero value but the sync path
+    // will return a 0 value.  Either this should return 0 or the other code path should do a callback with
+    // a failure.
+    thisPtr->m_mainThreadLoader = ThreadableLoader::create(context, thisPtr, *request, callbacksSetting, contentSniff);
+    ASSERT(thisPtr->m_mainThreadLoader);
+}
+
+void WorkerThreadableLoader::MainThreadBridge::mainThreadDestroy(ScriptExecutionContext* context, MainThreadBridge* thisPtr)
+{
+    ASSERT(isMainThread());
+    ASSERT_UNUSED(context, context->isDocument());
+    delete thisPtr;
+}
+
+void WorkerThreadableLoader::MainThreadBridge::destroy()
+{
+    // Ensure that no more client callbacks are done in the worker context's thread.
+    clearClientWrapper();
+
+    // "delete this" and m_mainThreadLoader::deref() on the worker object's thread.
+    m_messagingProxy.postTaskToWorkerObject(createCallbackTask(&MainThreadBridge::mainThreadDestroy, this));
+}
+
+void WorkerThreadableLoader::MainThreadBridge::mainThreadCancel(ScriptExecutionContext* context, MainThreadBridge* thisPtr)
+{
+    ASSERT(isMainThread());
+    ASSERT_UNUSED(context, context->isDocument());
+
+    if (!thisPtr->m_mainThreadLoader)
+        return;
+    thisPtr->m_mainThreadLoader->cancel();
+    thisPtr->m_mainThreadLoader = 0;
+}
+
+void WorkerThreadableLoader::MainThreadBridge::cancel()
+{
+    m_messagingProxy.postTaskToWorkerObject(createCallbackTask(&MainThreadBridge::mainThreadCancel, this));
+    ThreadableLoaderClientWrapper* clientWrapper = static_cast<ThreadableLoaderClientWrapper*>(m_workerClientWrapper.get());
+    if (!clientWrapper->done()) {
+        // If the client hasn't reached a termination state, then transition it by sending a cancellation error.
+        // Note: no more client callbacks will be done after this method -- the clearClientWrapper() call ensures that.
+        ResourceError error(String(), 0, String(), String());
+        error.setIsCancellation(true);
+        clientWrapper->didFail(error);
+    }
+    clearClientWrapper();
+}
+
+void WorkerThreadableLoader::MainThreadBridge::clearClientWrapper()
+{
+    static_cast<ThreadableLoaderClientWrapper*>(m_workerClientWrapper.get())->clearClient();
+}
+
+static void workerContextDidSendData(ScriptExecutionContext* context, RefPtr<ThreadableLoaderClientWrapper> workerClientWrapper, unsigned long long bytesSent, unsigned long long totalBytesToBeSent)
+{
+    ASSERT_UNUSED(context, context->isWorkerContext());
+    workerClientWrapper->didSendData(bytesSent, totalBytesToBeSent);
+}
+
+void WorkerThreadableLoader::MainThreadBridge::didSendData(unsigned long long bytesSent, unsigned long long totalBytesToBeSent)
+{
+    m_messagingProxy.postTaskForModeToWorkerContext(createCallbackTask(&workerContextDidSendData, m_workerClientWrapper, bytesSent, totalBytesToBeSent), m_taskMode);
+}
+
+static void workerContextDidReceiveResponse(ScriptExecutionContext* context, RefPtr<ThreadableLoaderClientWrapper> workerClientWrapper, auto_ptr<CrossThreadResourceResponseData> responseData)
+{
+    ASSERT_UNUSED(context, context->isWorkerContext());
+    OwnPtr<ResourceResponse> response(ResourceResponse::adopt(responseData));
+    workerClientWrapper->didReceiveResponse(*response);
+}
+
+void WorkerThreadableLoader::MainThreadBridge::didReceiveResponse(const ResourceResponse& response)
+{
+    m_messagingProxy.postTaskForModeToWorkerContext(createCallbackTask(&workerContextDidReceiveResponse, m_workerClientWrapper, response), m_taskMode);
+}
+
+static void workerContextDidReceiveData(ScriptExecutionContext* context, RefPtr<ThreadableLoaderClientWrapper> workerClientWrapper, auto_ptr<Vector<char> > vectorData)
+{
+    ASSERT_UNUSED(context, context->isWorkerContext());
+    workerClientWrapper->didReceiveData(vectorData->data(), vectorData->size());
+}
+
+void WorkerThreadableLoader::MainThreadBridge::didReceiveData(const char* data, int lengthReceived)
+{
+    auto_ptr<Vector<char> > vector(new Vector<char>(lengthReceived)); // needs to be an auto_ptr for usage with createCallbackTask.
+    memcpy(vector->data(), data, lengthReceived);
+    m_messagingProxy.postTaskForModeToWorkerContext(createCallbackTask(&workerContextDidReceiveData, m_workerClientWrapper, vector), m_taskMode);
+}
+
+static void workerContextDidFinishLoading(ScriptExecutionContext* context, RefPtr<ThreadableLoaderClientWrapper> workerClientWrapper, unsigned long identifier)
+{
+    ASSERT_UNUSED(context, context->isWorkerContext());
+    workerClientWrapper->didFinishLoading(identifier);
+}
+
+void WorkerThreadableLoader::MainThreadBridge::didFinishLoading(unsigned long identifier)
+{
+    m_messagingProxy.postTaskForModeToWorkerContext(createCallbackTask(&workerContextDidFinishLoading, m_workerClientWrapper, identifier), m_taskMode);
+}
+
+static void workerContextDidFail(ScriptExecutionContext* context, RefPtr<ThreadableLoaderClientWrapper> workerClientWrapper, const ResourceError& error)
+{
+    ASSERT_UNUSED(context, context->isWorkerContext());
+    workerClientWrapper->didFail(error);
+}
+
+void WorkerThreadableLoader::MainThreadBridge::didFail(const ResourceError& error)
+{
+    m_messagingProxy.postTaskForModeToWorkerContext(createCallbackTask(&workerContextDidFail, m_workerClientWrapper, error), m_taskMode);
+}
+
+static void workerContextDidFailRedirectCheck(ScriptExecutionContext* context, RefPtr<ThreadableLoaderClientWrapper> workerClientWrapper)
+{
+    ASSERT_UNUSED(context, context->isWorkerContext());
+    workerClientWrapper->didFailRedirectCheck();
+}
+
+void WorkerThreadableLoader::MainThreadBridge::didFailRedirectCheck()
+{
+    m_messagingProxy.postTaskForModeToWorkerContext(createCallbackTask(&workerContextDidFailRedirectCheck, m_workerClientWrapper), m_taskMode);
+}
+
+static void workerContextDidReceiveAuthenticationCancellation(ScriptExecutionContext* context, RefPtr<ThreadableLoaderClientWrapper> workerClientWrapper, auto_ptr<CrossThreadResourceResponseData> responseData)
+{
+    ASSERT_UNUSED(context, context->isWorkerContext());
+    OwnPtr<ResourceResponse> response(ResourceResponse::adopt(responseData));
+    workerClientWrapper->didReceiveAuthenticationCancellation(*response);
+}
+
+void WorkerThreadableLoader::MainThreadBridge::didReceiveAuthenticationCancellation(const ResourceResponse& response)
+{
+    m_messagingProxy.postTaskForModeToWorkerContext(createCallbackTask(&workerContextDidReceiveAuthenticationCancellation, m_workerClientWrapper, response), m_taskMode);
+}
+
+} // namespace WebCore
+
+#endif // ENABLE(WORKERS)