Introduce FragmentData, and put ObjectPaintProperties into it.

third_party/WebKit/Source/core/layout/LayoutObject.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2012 Apple Inc.
  *               All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 1792 matching lines @@
    protected:
     friend class PaintPropertyTreeBuilder;
     FRIEND_TEST_ALL_PREFIXES(AnimationCompositorAnimationsTest,
                              canStartAnimationOnCompositorTransformSPv2);
     FRIEND_TEST_ALL_PREFIXES(AnimationCompositorAnimationsTest,
                              canStartAnimationOnCompositorEffectSPv2);
 
     // The following non-const functions for ObjectPaintProperties should only
     // be called from PaintPropertyTreeBuilder.
     ObjectPaintProperties& EnsurePaintProperties() {
-      return layout_object_.EnsureRarePaintData().EnsurePaintProperties();
+      return layout_object_.EnsureRarePaintData()
+          .EnsureFragment()
+          .EnsurePaintProperties();
     }
     ObjectPaintProperties* PaintProperties() {
       if (auto* paint_data = layout_object_.GetRarePaintData())
         return paint_data->PaintProperties();
       return nullptr;
     }
     void ClearPaintProperties() {
-      if (auto* paint_data = layout_object_.GetRarePaintData())
-        paint_data->ClearPaintProperties();
+      if (auto* paint_data = layout_object_.GetRarePaintData()) {
+        if (auto* fragment = paint_data->Fragment())
+          fragment->ClearPaintProperties();
+      }
     }
 
     // The following non-const functions for local border box properties should
     // only be called from PaintPropertyTreeBuilder.
     void ClearLocalBorderBoxProperties() {
       if (auto* paint_data = layout_object_.GetRarePaintData())
         paint_data->ClearLocalBorderBoxProperties();
     }
     void SetLocalBorderBoxProperties(PropertyTreeState& local_border_box) {
       return layout_object_.EnsureRarePaintData().SetLocalBorderBoxProperties(
@@ skipping 994 matching lines @@
 CORE_EXPORT void showLineTree(const blink::LayoutObject*);
 CORE_EXPORT void showLayoutTree(const blink::LayoutObject* object1);
 // We don't make object2 an optional parameter so that showLayoutTree
 // can be called from gdb easily.
 CORE_EXPORT void showLayoutTree(const blink::LayoutObject* object1,
                                 const blink::LayoutObject* object2);
 
 #endif
 
 #endif  // LayoutObject_h