Do-not-commit: Count layout tree memory usage

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

Index: third_party/WebKit/Source/core/layout/LayoutBox.h
diff --git a/third_party/WebKit/Source/core/layout/LayoutBox.h b/third_party/WebKit/Source/core/layout/LayoutBox.h
index aca950dfdaef5226338fab9bb65e51c04b10e851..22eda42244395cfac14b4db0fdc4e1d4944aad17 100644
--- a/third_party/WebKit/Source/core/layout/LayoutBox.h
+++ b/third_party/WebKit/Source/core/layout/LayoutBox.h
@@ -1480,6 +1480,16 @@ class CORE_EXPORT LayoutBox : public LayoutBoxModelObject {
   bool skipContainingBlockForPercentHeightCalculation(
       const LayoutBox* containingBlock) const;
 
+  char objectSize() const override { return sizeof(this); }
+  char approximateHeapMemoryUsage() const override {
+    int memory = LayoutBoxModelObject::approximateHeapMemoryUsage();
+    if (m_overflow)
+      memory += sizeof(BoxOverflowModel);
+    if (m_rareData)
+      memory += sizeof(LayoutBoxRareData);
+    return memory;
+  }
+
  private:
   void updateShapeOutsideInfoAfterStyleChange(const ComputedStyle&,
                                               const ComputedStyle* oldStyle);