Revert "Move ViewDisplayList to GraphicsLayer"

Source/platform/graphics/paint/DrawingDisplayItem.h

-// Copyright 2014 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 DrawingDisplayItem_h
-#define DrawingDisplayItem_h
-
-#include "platform/PlatformExport.h"
-#include "platform/geometry/FloatPoint.h"
-#include "platform/graphics/paint/DisplayItem.h"
-#include "third_party/skia/include/core/SkPicture.h"
-
-namespace blink {
-
-class PLATFORM_EXPORT DrawingDisplayItem : public DisplayItem {
-public:
-    DrawingDisplayItem(DisplayItemClient client, Type type, PassRefPtr<SkPicture> picture, const FloatPoint& location)
-        : DisplayItem(client, type), m_picture(picture), m_location(location) { }
-
-    PassRefPtr<SkPicture> picture() const { return m_picture; }
-    const FloatPoint& location() const { return m_location; }
-
-private:
-    virtual void replay(GraphicsContext*);
-
-    RefPtr<SkPicture> m_picture;
-    const FloatPoint m_location;
-#ifndef NDEBUG
-    virtual WTF::String asDebugString() const override;
-#endif
-};
-
-} // namespace blink
-
-#endif // DrawingDisplayItem_h