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

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

Index: third_party/WebKit/Source/bindings/tests/results/core/VoidCallbackFunctionInterfaceArg.h
diff --git a/third_party/WebKit/Source/bindings/tests/results/core/VoidCallbackFunctionInterfaceArg.h b/third_party/WebKit/Source/bindings/tests/results/core/VoidCallbackFunctionInterfaceArg.h
index fa825b209e828135898cb9a704aff5a5a2e5d28a..3648e1d5b3f25e33282e56ce742872537441c672 100644
--- a/third_party/WebKit/Source/bindings/tests/results/core/VoidCallbackFunctionInterfaceArg.h
+++ b/third_party/WebKit/Source/bindings/tests/results/core/VoidCallbackFunctionInterfaceArg.h
@@ -13,6 +13,7 @@
 #ifndef VoidCallbackFunctionInterfaceArg_h
 #define VoidCallbackFunctionInterfaceArg_h
 
+#include "bindings/core/v8/NativeValueTraits.h"
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "bindings/core/v8/TraceWrapperV8Reference.h"
 #include "core/CoreExport.h"
@@ -46,6 +47,11 @@ class CORE_EXPORT VoidCallbackFunctionInterfaceArg final : public GarbageCollect
   TraceWrapperV8Reference<v8::Function> m_callback;
 };
 
+template <>
+struct NativeValueTraits<VoidCallbackFunctionInterfaceArg> : public NativeValueTraitsBase<VoidCallbackFunctionInterfaceArg> {
+  CORE_EXPORT static VoidCallbackFunctionInterfaceArg* nativeValue(v8::Isolate*, v8::Local<v8::Value>, ExceptionState&);
+};
+
 }  // namespace blink
 
 #endif  // VoidCallbackFunctionInterfaceArg_h