Refactor to centralize code which decides whether ObjectPaintProperties are needed.

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 683424a848048440e1f52be02f05b514a753378a..6d8b0a2381b16c39744b9b3bbf560f0cd1512a9f 100644
--- a/third_party/WebKit/Source/core/layout/LayoutObject.h
+++ b/third_party/WebKit/Source/core/layout/LayoutObject.h
@@ -1817,6 +1817,10 @@ class CORE_EXPORT LayoutObject : public ImageResourceObserver,
         return paint_data->PaintProperties();
       return nullptr;
     }
+    void ClearPaintProperties() {
+      if (auto* paint_data = layout_object_.GetRarePaintData())
+        paint_data->ClearPaintProperties();
+    }
 
     // The following non-const functions for local border box properties should
     // only be called from PaintPropertyTreeBuilder.