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

cc/playback/drawing_display_item.cc

-// 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.
-
-#include "cc/playback/drawing_display_item.h"
-
-#include "third_party/skia/include/core/SkPicture.h"
-
-namespace cc {
-
-DrawingDisplayItem::DrawingDisplayItem() : DisplayItem(DRAWING) {}
-
-DrawingDisplayItem::DrawingDisplayItem(sk_sp<const PaintRecord> record)
-    : DisplayItem(DRAWING), picture(std::move(record)) {}
-
-DrawingDisplayItem::DrawingDisplayItem(const DrawingDisplayItem& item)
-    : DisplayItem(DRAWING), picture(item.picture) {}
-
-DrawingDisplayItem::~DrawingDisplayItem() = default;
-
-size_t DrawingDisplayItem::ExternalMemoryUsage() const {
-  return picture->approximateBytesUsed();
-}
-
-DISABLE_CFI_PERF
-int DrawingDisplayItem::ApproximateOpCount() const {
-  return picture->approximateOpCount();
-}
-
-}  // namespace cc