Devtools: Margin resizer in overlay experiment

Source/core/dom/Node.h

Index: Source/core/dom/Node.h
diff --git a/Source/core/dom/Node.h b/Source/core/dom/Node.h
index 7d1ea14ccd552d288052ba2669cac13fe3b98a0b..345725faf7dd4b33d7dfa7ae048df6ea74a1438b 100644
--- a/Source/core/dom/Node.h
+++ b/Source/core/dom/Node.h
@@ -558,7 +558,7 @@ public:
 
     // Wrapper for nodes that don't have a layoutObject, but still cache the style (like HTMLOptionElement).
     ComputedStyle* mutableComputedStyle() const;
-    const ComputedStyle* computedStyle() const;
+    virtual const ComputedStyle* computedStyle() const;
     const ComputedStyle* parentComputedStyle() const;
 
     const ComputedStyle& computedStyleRef() const;