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

cc/playback/float_clip_display_item.h

-// Copyright 2015 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_FLOAT_CLIP_DISPLAY_ITEM_H_
-#define CC_PLAYBACK_FLOAT_CLIP_DISPLAY_ITEM_H_
-
-#include <stddef.h>
-
-#include "cc/base/cc_export.h"
-#include "cc/playback/display_item.h"
-#include "ui/gfx/geometry/rect_f.h"
-
-namespace cc {
-
-class CC_EXPORT FloatClipDisplayItem : public DisplayItem {
- public:
-  explicit FloatClipDisplayItem(const gfx::RectF& clip_rect);
-  ~FloatClipDisplayItem() override;
-
-  size_t ExternalMemoryUsage() const { return 0; }
-  int ApproximateOpCount() const { return 1; }
-
-  const gfx::RectF clip_rect;
-};
-
-class CC_EXPORT EndFloatClipDisplayItem : public DisplayItem {
- public:
-  EndFloatClipDisplayItem();
-  ~EndFloatClipDisplayItem() override;
-
-  int ApproximateOpCount() const { return 0; }
-};
-
-}  // namespace cc
-
-#endif  // CC_PLAYBACK_FLOAT_CLIP_DISPLAY_ITEM_H_