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

third_party/WebKit/Source/modules/csspaint/CSSPaintWorklet.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 CSSPaintWorklet_h
+#define CSSPaintWorklet_h
+
+#include "modules/ModulesExport.h"
+#include "platform/heap/Handle.h"
+
+namespace blink {
+
+class Document;
+class PaintWorklet;
+class ScriptState;
+class Worklet;
+
+class MODULES_EXPORT CSSPaintWorklet {
+ public:
+  static Worklet* paintWorklet(ScriptState*);
+  static PaintWorklet* paintWorklet(Document&);
+};
+
+}  // namespace blink
+
+#endif  // CSSPaintWorklet_h