[DONT COMMIT] PaintWorklet: Move paintWorklet from 'window' to 'CSS'

third_party/WebKit/Source/modules/csspaint/WindowPaintWorklet.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 WindowPaintWorklet_h
-#define WindowPaintWorklet_h
-
-#include "modules/ModulesExport.h"
-#include "platform/Supplementable.h"
-#include "platform/heap/Handle.h"
-
-namespace blink {
-
-class LocalDOMWindow;
-class PaintWorklet;
-class Worklet;
-
-class MODULES_EXPORT WindowPaintWorklet final
-    : public GarbageCollected<WindowPaintWorklet>,
-      public Supplement<LocalDOMWindow> {
-  USING_GARBAGE_COLLECTED_MIXIN(WindowPaintWorklet);
-
- public:
-  static WindowPaintWorklet& From(LocalDOMWindow&);
-  static Worklet* paintWorklet(LocalDOMWindow&);
-  PaintWorklet* paintWorklet();
-
-  DECLARE_TRACE();
-
- private:
-  explicit WindowPaintWorklet(LocalDOMWindow&);
-  static const char* SupplementName();
-
-  Member<PaintWorklet> paint_worklet_;
-};
-
-}  // namespace blink
-
-#endif  // WindowPaintWorklet_h