Do-not-commit: Count layout tree memory usage

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

Index: third_party/WebKit/Source/core/layout/svg/LayoutSVGResourceMasker.h
diff --git a/third_party/WebKit/Source/core/layout/svg/LayoutSVGResourceMasker.h b/third_party/WebKit/Source/core/layout/svg/LayoutSVGResourceMasker.h
index 3941c658b85548b75d1c29ffbe131c23b0340f23..f5c577c62bbee9ecca0cd9a21131b1309038d81f 100644
--- a/third_party/WebKit/Source/core/layout/svg/LayoutSVGResourceMasker.h
+++ b/third_party/WebKit/Source/core/layout/svg/LayoutSVGResourceMasker.h
@@ -37,6 +37,12 @@ class LayoutSVGResourceMasker final : public LayoutSVGResourceContainer {
   ~LayoutSVGResourceMasker() override;
 
   const char* name() const override { return "LayoutSVGResourceMasker"; }
+  char objectSize() const override { return sizeof(this); }
+  char approximateHeapMemoryUsage() const override {
+    int memory = LayoutSVGResourceContainer::approximateHeapMemoryUsage();
+    // TODO(pdr): Include memory from m_cachedPaintRecord.
+    return memory;
+  }
 
   void removeAllClientsFromCache(bool markForInvalidation = true) override;
   void removeClientFromCache(LayoutObject*,