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

cc/playback/compositing_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/compositing_display_item.h"
-
-#include "third_party/skia/include/core/SkColorFilter.h"
-
-namespace cc {
-
-CompositingDisplayItem::CompositingDisplayItem(
-    uint8_t alpha,
-    SkBlendMode xfermode,
-    SkRect* bounds,
-    sk_sp<SkColorFilter> color_filter,
-    bool lcd_text_requires_opaque_layer)
-    : DisplayItem(COMPOSITING),
-      alpha(alpha),
-      xfermode(xfermode),
-      has_bounds(!!bounds),
-      bounds(bounds ? SkRect(*bounds) : SkRect()),
-      color_filter(std::move(color_filter)),
-      lcd_text_requires_opaque_layer(lcd_text_requires_opaque_layer) {}
-
-CompositingDisplayItem::~CompositingDisplayItem() = default;
-
-EndCompositingDisplayItem::EndCompositingDisplayItem()
-    : DisplayItem(END_COMPOSITING) {}
-
-EndCompositingDisplayItem::~EndCompositingDisplayItem() = default;
-
-}  // namespace cc