Do-not-commit: Count layout tree memory usage

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

Index: third_party/WebKit/Source/core/layout/LayoutCounter.h
diff --git a/third_party/WebKit/Source/core/layout/LayoutCounter.h b/third_party/WebKit/Source/core/layout/LayoutCounter.h
index 0844eae613e4aea4b950975a21b2988a654a698d..2165f2b92b8693063acba0f7984a61c1b1296e4c 100644
--- a/third_party/WebKit/Source/core/layout/LayoutCounter.h
+++ b/third_party/WebKit/Source/core/layout/LayoutCounter.h
@@ -76,6 +76,9 @@ class LayoutCounter final : public LayoutText {
   bool isOfType(LayoutObjectType type) const override {
     return type == LayoutObjectCounter || LayoutText::isOfType(type);
   }
+
+  char objectSize() const override { return sizeof(this); }
+
   PassRefPtr<StringImpl> originalText() const override;
 
   // Removes the reference to the CounterNode associated with this layoutObject.