Do-not-commit: Count layout tree memory usage

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

Index: third_party/WebKit/Source/core/layout/LayoutTextFragment.h
diff --git a/third_party/WebKit/Source/core/layout/LayoutTextFragment.h b/third_party/WebKit/Source/core/layout/LayoutTextFragment.h
index ea1b4d4bfa4593ed287432cf11cfebd50d474fc9..deff713337fd9ee70d16e0e8ba012fa517f1b025 100644
--- a/third_party/WebKit/Source/core/layout/LayoutTextFragment.h
+++ b/third_party/WebKit/Source/core/layout/LayoutTextFragment.h
@@ -50,6 +50,12 @@ class LayoutTextFragment final : public LayoutText {
                                              unsigned length);
 
   bool isTextFragment() const override { return true; }
+  char objectSize() const override { return sizeof(this); }
+  char approximateHeapMemoryUsage() const override {
+    int memory = LayoutText::approximateHeapMemoryUsage();
+    // TODO(pdr): Include memory from m_contentString?
+    return memory;
+  }
 
   bool canBeSelectionLeaf() const override {
     return node() && hasEditableStyle(*node());