bindings: Add C++ versions of WebIDL types and generalize NativeValueTraits.

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

Index: third_party/WebKit/Source/bindings/tests/results/core/VoidCallbackFunctionTypedef.h
diff --git a/third_party/WebKit/Source/bindings/tests/results/core/VoidCallbackFunctionTypedef.h b/third_party/WebKit/Source/bindings/tests/results/core/VoidCallbackFunctionTypedef.h
index 93c5b186c11cb78f5bd3b078644b4b28add70ecf..ab2cebb164b4733ce5226f1ed4cac0418a5592e1 100644
--- a/third_party/WebKit/Source/bindings/tests/results/core/VoidCallbackFunctionTypedef.h
+++ b/third_party/WebKit/Source/bindings/tests/results/core/VoidCallbackFunctionTypedef.h
@@ -13,6 +13,7 @@
 #ifndef VoidCallbackFunctionTypedef_h
 #define VoidCallbackFunctionTypedef_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 +46,11 @@ class CORE_EXPORT VoidCallbackFunctionTypedef final : public GarbageCollectedFin
   TraceWrapperV8Reference<v8::Function> m_callback;
 };
 
+template <>
+struct NativeValueTraits<VoidCallbackFunctionTypedef> : public NativeValueTraitsBase<VoidCallbackFunctionTypedef> {
+  CORE_EXPORT static VoidCallbackFunctionTypedef* nativeValue(v8::Isolate*, v8::Local<v8::Value>, ExceptionState&);
+};
+
 }  // namespace blink
 
 #endif  // VoidCallbackFunctionTypedef_h