Store paint properties directly on LayoutObject

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

Index: third_party/WebKit/Source/core/layout/LayoutObject.h
diff --git a/third_party/WebKit/Source/core/layout/LayoutObject.h b/third_party/WebKit/Source/core/layout/LayoutObject.h
index 7e254c61171df44be03054f2b12ff138a82a5deb..87ea2a4ebba246a4f98d0dad57f6afb0f8a6f179 100644
--- a/third_party/WebKit/Source/core/layout/LayoutObject.h
+++ b/third_party/WebKit/Source/core/layout/LayoutObject.h
@@ -2380,6 +2380,10 @@ class CORE_EXPORT LayoutObject : public ImageResourceObserver,
   // paint offset change for paint invalidation on SPv2, and partial paint
   // property tree update for SlimmingPaintInvalidation on SPv1 and SPv2.
   LayoutPoint m_previousPaintOffset;
+
+  // For SPv2 only. The ObjectPaintProperties structure holds references to the
+  // property tree nodes that are created by the layout object for painting.
+  std::unique_ptr<ObjectPaintProperties> m_paintProperties;
 };
 
 // FIXME: remove this once the layout object lifecycle ASSERTS are no longer