Do-not-commit: Count layout tree memory usage

third_party/WebKit/Source/core/layout/svg/LayoutSVGResourceFilter.h

Index: third_party/WebKit/Source/core/layout/svg/LayoutSVGResourceFilter.h
diff --git a/third_party/WebKit/Source/core/layout/svg/LayoutSVGResourceFilter.h b/third_party/WebKit/Source/core/layout/svg/LayoutSVGResourceFilter.h
index bb3b2ae2da1bfb92858c3e96fcac4f07894a9699..56427cd4cfc71fb5237fda8dc736da66e3f3743f 100644
--- a/third_party/WebKit/Source/core/layout/svg/LayoutSVGResourceFilter.h
+++ b/third_party/WebKit/Source/core/layout/svg/LayoutSVGResourceFilter.h
@@ -77,6 +77,12 @@ class LayoutSVGResourceFilter final : public LayoutSVGResourceContainer {
     return type == LayoutObjectSVGResourceFilter ||
            LayoutSVGResourceContainer::isOfType(type);
   }
+  char objectSize() const override { return sizeof(this); }
+  char approximateHeapMemoryUsage() const override {
+    int memory = LayoutSVGResourceContainer::approximateHeapMemoryUsage();
+    // TODO(pdr): Include memory from m_filter.
+    return memory;
+  }
 
   void removeAllClientsFromCache(bool markForInvalidation = true) override;
   void removeClientFromCache(LayoutObject*,