compositor-worker: Introduce CompositorWorker.

Source/modules/compositorworker/CompositorWorkerGlobalScope.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 CompositorWorkerGlobalScope_h
+#define CompositorWorkerGlobalScope_h
+
+#include "core/dom/MessagePort.h"
+#include "core/workers/WorkerGlobalScope.h"
+
+namespace blink {
+
+class CompositorWorkerThread;
+class WorkerThreadStartupData;
+
+class CompositorWorkerGlobalScope final : public WorkerGlobalScope {
+    DEFINE_WRAPPERTYPEINFO();
+public:
+    static PassRefPtrWillBeRawPtr<CompositorWorkerGlobalScope> create(CompositorWorkerThread*, PassOwnPtrWillBeRawPtr<WorkerThreadStartupData>, double timeOrigin);
+    virtual ~CompositorWorkerGlobalScope();
+
+    // EventTarget
+    const AtomicString& interfaceName() const override;
+
+    void postMessage(ExecutionContext*, PassRefPtr<SerializedScriptValue>, const MessagePortArray*, ExceptionState&);
+    DEFINE_ATTRIBUTE_EVENT_LISTENER(message);
+
+    void executeCompositorFrameCallbacks(double monotonicTimeNow);
+
+    // ExecutionContext:
+    bool isCompositorWorkerGlobalScope() const override { return true; }
+
+private:
+    CompositorWorkerGlobalScope(const KURL&, const String& userAgent, CompositorWorkerThread*, double timeOrigin, const SecurityOrigin*, PassOwnPtrWillBeRawPtr<WorkerClients>);
+    CompositorWorkerThread* thread() const;
+};
+
+} // namespace blink
+
+#endif // CompositorWorkerGlobalScope_h