Do-not-commit: Count layout tree memory usage

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

Index: third_party/WebKit/Source/core/layout/LayoutTableCell.h
diff --git a/third_party/WebKit/Source/core/layout/LayoutTableCell.h b/third_party/WebKit/Source/core/layout/LayoutTableCell.h
index eb63f020e358aaf53c69e7e1e47922ef0e0c8edb..d7d2dab10450529c95f131be05a1fd38ee7552ee 100644
--- a/third_party/WebKit/Source/core/layout/LayoutTableCell.h
+++ b/third_party/WebKit/Source/core/layout/LayoutTableCell.h
@@ -88,6 +88,16 @@ class CORE_EXPORT LayoutTableCell final : public LayoutBlockFlow {
  public:
   explicit LayoutTableCell(Element*);
 
+  char objectSize() const override { return sizeof(this); }
+  char approximateHeapMemoryUsage() const override {
+    int memory = LayoutBlockFlow::approximateHeapMemoryUsage();
+    if (m_collapsedBorderValues)
+      memory += sizeof(CollapsedBorderValues);
+    if (m_rowBackgroundDisplayItemClient)
+      memory += sizeof(RowBackgroundDisplayItemClient);
+    return memory;
+  }
+
   unsigned colSpan() const {
     if (!m_hasColSpan)
       return 1;