WIP bindings: Add support for the record<K,V> WebIDL type.

third_party/WebKit/Source/bindings/tests/results/core/VoidCallbackFunction.h

Index: third_party/WebKit/Source/bindings/tests/results/core/VoidCallbackFunction.h
diff --git a/third_party/WebKit/Source/bindings/tests/results/core/VoidCallbackFunction.h b/third_party/WebKit/Source/bindings/tests/results/core/VoidCallbackFunction.h
index fb1d4f7cf6906b1425bcbd71baf34a3093f76311..f6461c58638f910c32220b0a32a034fdc6641822 100644
--- a/third_party/WebKit/Source/bindings/tests/results/core/VoidCallbackFunction.h
+++ b/third_party/WebKit/Source/bindings/tests/results/core/VoidCallbackFunction.h
@@ -13,6 +13,7 @@
 #ifndef VoidCallbackFunction_h
 #define VoidCallbackFunction_h
 
+#include "bindings/core/v8/NativeValueTraits.h"
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "bindings/core/v8/TraceWrapperV8Reference.h"
 #include "core/CoreExport.h"
@@ -45,6 +46,12 @@ class CORE_EXPORT VoidCallbackFunction final : public GarbageCollectedFinalized<
   TraceWrapperV8Reference<v8::Function> m_callback;
 };
 
+template <>
+struct NativeValueTraits<VoidCallbackFunction> {
+  using ImplType = VoidCallbackFunction;
+  CORE_EXPORT static VoidCallbackFunction* nativeValue(v8::Isolate*, v8::Local<v8::Value>, ExceptionState&);
+};
+
 }  // namespace blink
 
 #endif  // VoidCallbackFunction_h