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

cc/playback/clip_path_display_item.cc

-// 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.
-
-#include "cc/playback/clip_path_display_item.h"
-
-namespace cc {
-
-ClipPathDisplayItem::ClipPathDisplayItem(const SkPath& clip_path,
-                                         bool antialias)
-    : DisplayItem(CLIP_PATH), clip_path(clip_path), antialias(antialias) {}
-
-ClipPathDisplayItem::~ClipPathDisplayItem() = default;
-
-EndClipPathDisplayItem::EndClipPathDisplayItem() : DisplayItem(END_CLIP_PATH) {}
-
-EndClipPathDisplayItem::~EndClipPathDisplayItem() = default;
-
-}  // namespace cc