Do-not-commit: Count layout tree memory usage

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

Index: third_party/WebKit/Source/core/layout/svg/LayoutSVGInlineText.h
diff --git a/third_party/WebKit/Source/core/layout/svg/LayoutSVGInlineText.h b/third_party/WebKit/Source/core/layout/svg/LayoutSVGInlineText.h
index dd86be76de94f5ff689717a6962eff9306fdb034..89367ec659cbf2d2d8da8228c995fd2482ba2aec 100644
--- a/third_party/WebKit/Source/core/layout/svg/LayoutSVGInlineText.h
+++ b/third_party/WebKit/Source/core/layout/svg/LayoutSVGInlineText.h
@@ -72,6 +72,14 @@ class LayoutSVGInlineText final : public LayoutText {
            LayoutText::isOfType(type);
   }
 
+  char objectSize() const override { return sizeof(this); }
+  char approximateHeapMemoryUsage() const override {
+    int memory = LayoutText::approximateHeapMemoryUsage();
+    // TODO(pdr): Also add memory from m_characterDataMap.
+    // TODO(pdr): Also add memory from m_metrics.
+    return memory;
+  }
+
   PositionWithAffinity positionForPoint(const LayoutPoint&) override;
   LayoutRect localCaretRect(
       InlineBox*,