Introduce PaintWorkletGlobalScope, rename renderWorklet attribute to paintWorklet.

third_party/WebKit/Source/modules/worklet/DOMWindowWorklet.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 DOMWindowWorklet_h
-#define DOMWindowWorklet_h
-
-#include "core/frame/DOMWindowProperty.h"
-#include "platform/Supplementable.h"
-#include "platform/heap/Handle.h"
-
-namespace blink {
-
-class DOMWindow;
-class ExecutionContext;
-class Worklet;
-
-class DOMWindowWorklet final : public NoBaseWillBeGarbageCollected<DOMWindowWorklet>, public WillBeHeapSupplement<LocalDOMWindow>, public DOMWindowProperty {
-    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(DOMWindowWorklet);
-    DECLARE_EMPTY_VIRTUAL_DESTRUCTOR_WILL_BE_REMOVED(DOMWindowWorklet);
-    USING_FAST_MALLOC_WILL_BE_REMOVED(DOMWindowWorklet);
-public:
-    static DOMWindowWorklet& from(LocalDOMWindow&);
-    static Worklet* renderWorklet(ExecutionContext*, DOMWindow&);
-    Worklet* renderWorklet(ExecutionContext*) const;
-
-    DECLARE_TRACE();
-
-private:
-    explicit DOMWindowWorklet(LocalDOMWindow&);
-    static const char* supplementName();
-
-    mutable PersistentWillBeMember<Worklet> m_renderWorklet;
-};
-
-} // namespace blink
-
-#endif // DOMWindowWorklet_h