[Do not submit] Worklet implementation.

third_party/WebKit/Source/modules/worklet/Worklet.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 Worklet_h
+#define Worklet_h
+
+#include "bindings/core/v8/ScriptWrappable.h"
+#include "core/dom/ActiveDOMObject.h"
+#include "modules/worklet/WorkletGlobalScope.h"
+#include "platform/heap/Handle.h"
+
+namespace blink {
+
+class ExecutionContext;
+class WorkletGlobalScope;
+class WorkletMessagingProxy;
+
+class Worklet final : public GarbageCollectedFinalized<Worklet>, public ScriptWrappable, public ActiveDOMObject {
+    WTF_MAKE_NONCOPYABLE(Worklet);
+    DEFINE_WRAPPERTYPEINFO();
+    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(Worklet);
+public:
+    static Worklet* create(ExecutionContext*);
+
+    double num();
+
+    DECLARE_TRACE();
+
+private:
+    explicit Worklet(ExecutionContext*);
+
+    RefPtrWillBeMember<WorkletGlobalScope> m_workletGlobalScope;
+    WorkletMessagingProxy* m_workletMessagingProxy;
+};
+
+} // namespace blink
+
+#endif // Worklet_h