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third_party/WebKit/Source/bindings/core/v8/V8PerContextData.h

Index: third_party/WebKit/Source/bindings/core/v8/V8PerContextData.h
diff --git a/third_party/WebKit/Source/bindings/core/v8/V8PerContextData.h b/third_party/WebKit/Source/bindings/core/v8/V8PerContextData.h
index dd345df3a033686b8a8a49f20ed2d21f5974f2d0..86ecec0e1dfaef1db85fcd4c6589f4be6d6648d3 100644
--- a/third_party/WebKit/Source/bindings/core/v8/V8PerContextData.h
+++ b/third_party/WebKit/Source/bindings/core/v8/V8PerContextData.h
@@ -85,6 +85,14 @@ class CORE_EXPORT V8PerContextData final {
                                         : constructorForTypeSlowCase(type);
   }
 
+  // Retrieve the constructor for a type, but only if it already exists (avoids
+  // triggering initialization, as in constructorForType). If the constructor is
+  // not found, the return value is non-null, but empty (IsEmpty()).
+  v8::Local<v8::Function> constructorForTypeFromCache(
+      const WrapperTypeInfo* type) {
+    return m_constructorMap.Get(type);
+  }
+
   v8::Local<v8::Object> prototypeForType(const WrapperTypeInfo*);
 
   void addCustomElementBinding(std::unique_ptr<V0CustomElementBinding>);