compositor-worker: Introduce CompositorWorker.

Source/modules/compositorworker/CompositorWorker.h

+// Copyright 2015 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 CompositorWorker_h
+#define CompositorWorker_h
+
+#include "core/workers/Worker.h"
+#include "wtf/PassRefPtr.h"
+#include "wtf/text/AtomicString.h"
+
+namespace blink {
+
+class ExceptionState;
+class ExecutionContext;
+class WorkerGlobalScopeProxy;
+
+class CompositorWorker final : public Worker {
+    DEFINE_WRAPPERTYPEINFO();
+public:
+    static PassRefPtrWillBeRawPtr<CompositorWorker> create(ExecutionContext*, const String& url, ExceptionState&);
+    ~CompositorWorker() override;
+
+    const AtomicString& interfaceName() const override;
+    WorkerGlobalScopeProxy* createWorkerGlobalScopeProxy(ExecutionContext*) override;
+
+private:
+    explicit CompositorWorker(ExecutionContext*);
+};
+
+} // namespace blink
+
+#endif // CompositorWorker_h