Do-not-commit: Count layout tree memory usage

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

Index: third_party/WebKit/Source/core/layout/LayoutObject.h
diff --git a/third_party/WebKit/Source/core/layout/LayoutObject.h b/third_party/WebKit/Source/core/layout/LayoutObject.h
index 1a10febda3a228e71f7df05f6c5f0ba7d636f1b9..22291aac1d3ea61533d5d7c85b0daf0719c73d95 100644
--- a/third_party/WebKit/Source/core/layout/LayoutObject.h
+++ b/third_party/WebKit/Source/core/layout/LayoutObject.h
@@ -639,6 +639,11 @@ class CORE_EXPORT LayoutObject : public ImageResourceObserver,
     return isOfType(LayoutObjectSVGResourceFilterPrimitive);
   }
 
+  // Total size of this object.
+  virtual char objectSize() const { return sizeof(this); }
+  // Total size of this object plus any heap-allocated memory.
+  virtual char approximateHeapMemoryUsage() const;
+
   // FIXME: Those belong into a SVG specific base-class for all layoutObjects
   // (see above). Unfortunately we don't have such a class yet, because it's not
   // possible for all layoutObjects to inherit from LayoutSVGObject ->