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

cc/playback/float_clip_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/float_clip_display_item.h"
-
-namespace cc {
-
-FloatClipDisplayItem::FloatClipDisplayItem(const gfx::RectF& clip_rect)
-    : DisplayItem(FLOAT_CLIP), clip_rect(clip_rect) {}
-
-FloatClipDisplayItem::~FloatClipDisplayItem() = default;
-
-EndFloatClipDisplayItem::EndFloatClipDisplayItem()
-    : DisplayItem(END_FLOAT_CLIP) {}
-
-EndFloatClipDisplayItem::~EndFloatClipDisplayItem() = default;
-
-}  // namespace cc