Skip paint property update and visual rect update if no geometry change

third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.h

Index: third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.h
diff --git a/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.h b/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.h
index dd18716e32bfe85f90e4a2b45ca2ff2f09199630..c3474d0d320dd40c6724792a6aba3f6cadd9396a 100644
--- a/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.h
+++ b/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.h
@@ -22,6 +22,17 @@ class LayoutObject;
 // It's responsible for bookkeeping tree state in other order, for example, the
 // most recent position container seen.
 struct PaintPropertyTreeBuilderContext {
+#if DCHECK_IS_ON()
+  PaintPropertyTreeBuilderContext() {}
+  PaintPropertyTreeBuilderContext(
+      const PaintPropertyTreeBuilderContext& parent) {
+    *this = parent;
+    parentUpdated = parent.updatedForSelf && parent.updatedForChildren;
+    updatedForSelf = false;
+    updatedForChildren = false;
+  }
+#endif
+
   // State that propagates on the containing block chain (and so is adjusted
   // when an absolute or fixed position object is encountered).
   struct ContainingBlockContext {
@@ -86,6 +97,12 @@ struct PaintPropertyTreeBuilderContext {
   // can be set due to paint offset changes or when the structure of the
   // property tree changes (i.e., a node is added or removed).
   bool forceSubtreeUpdate = false;
+
+#if DCHECK_IS_ON()
+  bool parentUpdated = false;
+  bool updatedForSelf = false;
+  bool updatedForChildren = false;
+#endif
 };
 
 // Creates paint property tree nodes for special things in the layout tree.