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

cc/playback/clip_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/clip_display_item.h"
-
-namespace cc {
-
-ClipDisplayItem::ClipDisplayItem(const gfx::Rect& clip_rect,
-                                 std::vector<SkRRect> rounded_clip_rects,
-                                 bool antialias)
-    : DisplayItem(CLIP),
-      clip_rect(clip_rect),
-      rounded_clip_rects(std::move(rounded_clip_rects)),
-      antialias(antialias) {}
-
-ClipDisplayItem::~ClipDisplayItem() = default;
-
-EndClipDisplayItem::EndClipDisplayItem() : DisplayItem(END_CLIP) {}
-
-EndClipDisplayItem::~EndClipDisplayItem() = default;
-
-}  // namespace cc