[proof-of-concept] SW thread independent of the main thread

third_party/WebKit/Source/modules/serviceworkers/IsolatedWorkerThread.h

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef IsolatedWorkerThread_h
+#define IsolatedWorkerThread_h
+
+#include "core/workers/WorkerThread.h"
+
+namespace blink {
+
+class WorkerBackingThread;
+
+class IsolatedWorkerThread final : public WorkerThread {
+public:
+    static std::unique_ptr<IsolatedWorkerThread> create(PassRefPtr<WorkerLoaderProxy>, WorkerReportingProxy&);
+    ~IsolatedWorkerThread() override;
+
+    WorkerBackingThread& workerBackingThread() override { return *m_workerBackingThread; }
+
+protected:
+    void clearWorkerBackingThread() override;
+    WorkerOrWorkletGlobalScope* createWorkerGlobalScope(std::unique_ptr<WorkerThreadStartupData>) override;
+
+private:
+    IsolatedWorkerThread(PassRefPtr<WorkerLoaderProxy>, WorkerReportingProxy&);
+    std::unique_ptr<WorkerBackingThread> m_workerBackingThread;
+};
+
+} // namespace blink
+
+#endif // IsolatedWorkerThread_h