Do-not-commit: Count layout tree memory usage

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

Index: third_party/WebKit/Source/core/layout/LayoutView.h
diff --git a/third_party/WebKit/Source/core/layout/LayoutView.h b/third_party/WebKit/Source/core/layout/LayoutView.h
index 3192c97ec23fd641c042b42269fd93c80264a010..a8170e3e1ab1ca647b250d2e715ca325c2c56a3a 100644
--- a/third_party/WebKit/Source/core/layout/LayoutView.h
+++ b/third_party/WebKit/Source/core/layout/LayoutView.h
@@ -75,6 +75,12 @@ class CORE_EXPORT LayoutView final : public LayoutBlockFlow {
   void clearHitTestCache();
 
   const char* name() const override { return "LayoutView"; }
+  char objectSize() const override { return sizeof(this); }
+  char approximateHeapMemoryUsage() const override {
+    int memory = LayoutBlockFlow::approximateHeapMemoryUsage();
+    // TODO(pdr): Include additional heap memory.
+    return memory;
+  }
 
   bool isOfType(LayoutObjectType type) const override {
     return type == LayoutObjectLayoutView || LayoutBlockFlow::isOfType(type);