Move cc::DisplayItemList and related classes into cc/paint/

cc/playback/drawing_display_item.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 CC_PLAYBACK_DRAWING_DISPLAY_ITEM_H_
-#define CC_PLAYBACK_DRAWING_DISPLAY_ITEM_H_
-
-#include <stddef.h>
-
-#include "cc/base/cc_export.h"
-#include "cc/paint/paint_record.h"
-#include "cc/playback/display_item.h"
-#include "third_party/skia/include/core/SkRefCnt.h"
-
-namespace cc {
-
-class CC_EXPORT DrawingDisplayItem : public DisplayItem {
- public:
-  DrawingDisplayItem();
-  explicit DrawingDisplayItem(sk_sp<const PaintRecord> record);
-  explicit DrawingDisplayItem(const DrawingDisplayItem& item);
-  ~DrawingDisplayItem() override;
-
-  size_t ExternalMemoryUsage() const;
-  int ApproximateOpCount() const;
-
-  const sk_sp<const PaintRecord> picture;
-};
-
-}  // namespace cc
-
-#endif  // CC_PLAYBACK_DRAWING_DISPLAY_ITEM_H_