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

cc/playback/transform_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/transform_display_item.h"
-
-namespace cc {
-
-TransformDisplayItem::TransformDisplayItem(const gfx::Transform& transform)
-    : DisplayItem(TRANSFORM), transform(transform) {}
-
-TransformDisplayItem::~TransformDisplayItem() = default;
-
-EndTransformDisplayItem::EndTransformDisplayItem()
-    : DisplayItem(END_TRANSFORM) {}
-
-EndTransformDisplayItem::~EndTransformDisplayItem() = default;
-
-}  // namespace cc