Do-not-commit: Count layout tree memory usage

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

Index: third_party/WebKit/Source/core/layout/LayoutObject.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutObject.cpp b/third_party/WebKit/Source/core/layout/LayoutObject.cpp
index 641347fed2d55aca27f9b65c598a3f83d5606b98..d1caf43e98d8f9c81dd7eb18aafd33c77f7a6740 100644
--- a/third_party/WebKit/Source/core/layout/LayoutObject.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutObject.cpp
@@ -257,6 +257,17 @@ bool LayoutObject::isLegend() const {
   return isHTMLLegendElement(node());
 }
 
+char LayoutObject::approximateHeapMemoryUsage() const {
+  int memory = 0;
+  if (m_style)
+    memory += sizeof(ComputedStyle);
+  if (m_paintProperties) {
+    memory += sizeof(ObjectPaintProperties);
+    memory += m_paintProperties->heapMemoryUsage();
+  }
+  return memory;
+}
+
 void LayoutObject::setIsInsideFlowThreadIncludingDescendants(
     bool insideFlowThread) {
   LayoutObject* next;