Do-not-commit: Count layout tree memory usage

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

Index: third_party/WebKit/Source/core/layout/LayoutTableSection.h
diff --git a/third_party/WebKit/Source/core/layout/LayoutTableSection.h b/third_party/WebKit/Source/core/layout/LayoutTableSection.h
index bf276c708b87020816f1e2911120ae70b0e20ad0..7b8fef8604573ee6be85aff0abeb0557bfca570d 100644
--- a/third_party/WebKit/Source/core/layout/LayoutTableSection.h
+++ b/third_party/WebKit/Source/core/layout/LayoutTableSection.h
@@ -308,6 +308,11 @@ class CORE_EXPORT LayoutTableSection final : public LayoutTableBoxComponent {
   bool hasMultipleCellLevels() const { return m_hasMultipleCellLevels; }
 
   const char* name() const override { return "LayoutTableSection"; }
+  char objectSize() const override { return sizeof(this); }
+  char approximateHeapMemoryUsage() const override {
+    // TODO(pdr): Include additional heap allocations in this class.
+    return LayoutTableBoxComponent::approximateHeapMemoryUsage();
+  }
 
   // Whether a section has opaque background depends on many factors, e.g.
   // border spacing, border collapsing, missing cells, etc. For simplicity,