Introduce PaintWorkletGlobalScope, rename renderWorklet attribute to paintWorklet.

third_party/WebKit/Source/modules/worklet/DOMWindowWorklet.cpp

-// 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.
-
-#include "modules/worklet/DOMWindowWorklet.h"
-
-#include "core/frame/LocalDOMWindow.h"
-#include "core/frame/LocalFrame.h"
-#include "modules/worklet/Worklet.h"
-
-namespace blink {
-
-DOMWindowWorklet::DOMWindowWorklet(LocalDOMWindow& window)
-    : DOMWindowProperty(window.frame())
-{
-}
-
-DEFINE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(DOMWindowWorklet);
-
-const char* DOMWindowWorklet::supplementName()
-{
-    return "DOMWindowWorklet";
-}
-
-// static
-DOMWindowWorklet& DOMWindowWorklet::from(LocalDOMWindow& window)
-{
-    DOMWindowWorklet* supplement = static_cast<DOMWindowWorklet*>(WillBeHeapSupplement<LocalDOMWindow>::from(window, supplementName()));
-    if (!supplement) {
-        supplement = new DOMWindowWorklet(window);
-        provideTo(window, supplementName(), adoptPtrWillBeNoop(supplement));
-    }
-    return *supplement;
-}
-
-// static
-Worklet* DOMWindowWorklet::renderWorklet(ExecutionContext* executionContext, DOMWindow& window)
-{
-    return from(toLocalDOMWindow(window)).renderWorklet(executionContext);
-}
-
-Worklet* DOMWindowWorklet::renderWorklet(ExecutionContext* executionContext) const
-{
-    if (!m_renderWorklet && frame())
-        m_renderWorklet = Worklet::create(frame(), executionContext);
-    return m_renderWorklet.get();
-}
-
-DEFINE_TRACE(DOMWindowWorklet)
-{
-    visitor->trace(m_renderWorklet);
-    WillBeHeapSupplement<LocalDOMWindow>::trace(visitor);
-    DOMWindowProperty::trace(visitor);
-}
-
-} // namespace blink