Introduce WorkletGlobalScopeProxy interface.

third_party/WebKit/Source/modules/worklet/ThreadedWorkletGlobalScopeProxy.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 ThreadedWorkletGlobalScopeProxy_h
+#define ThreadedWorkletGlobalScopeProxy_h
+
+#include "core/workers/WorkletGlobalScopeProxy.h"
+#include "modules/worklet/WorkletThread.h"
+
+namespace blink {
+
+class ThreadedWorkletGlobalScopeProxy : public WorkletGlobalScopeProxy {
+public:
+    ~ThreadedWorkletGlobalScopeProxy() override;
+
+    // WorkletGlobalScopeProxy
+    void evaluateScript(const String& source, const KURL& scriptURL) final;
+    void terminateWorkletGlobalScope() final;
+
+protected:
+    ThreadedWorkletGlobalScopeProxy(PassOwnPtr<WorkletThread>);
+
+private:
+    OwnPtr<WorkletThread> m_workletThread;
+};
+
+} // namespace blink
+
+#endif // ThreadedWorkletGlobalScopeProxy_h