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

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

Index: third_party/WebKit/Source/bindings/tests/results/core/AnyCallbackFunctionOptionalAnyArg.h
diff --git a/third_party/WebKit/Source/bindings/tests/results/core/AnyCallbackFunctionOptionalAnyArg.h b/third_party/WebKit/Source/bindings/tests/results/core/AnyCallbackFunctionOptionalAnyArg.h
index 42cbf08a3609afcc963b9df36a1fc6041bd92a78..e71b5310b646d6cbaf37ad749d157275a1d6ea5f 100644
--- a/third_party/WebKit/Source/bindings/tests/results/core/AnyCallbackFunctionOptionalAnyArg.h
+++ b/third_party/WebKit/Source/bindings/tests/results/core/AnyCallbackFunctionOptionalAnyArg.h
@@ -13,6 +13,7 @@
 #ifndef AnyCallbackFunctionOptionalAnyArg_h
 #define AnyCallbackFunctionOptionalAnyArg_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 AnyCallbackFunctionOptionalAnyArg final : public GarbageCollec
   TraceWrapperV8Reference<v8::Function> m_callback;
 };
 
+template <>
+struct NativeValueTraits<AnyCallbackFunctionOptionalAnyArg> {
+  using ImplType = AnyCallbackFunctionOptionalAnyArg;
+  CORE_EXPORT static AnyCallbackFunctionOptionalAnyArg* nativeValue(v8::Isolate*, v8::Local<v8::Value>, ExceptionState&);
+};
+
 }  // namespace blink
 
 #endif  // AnyCallbackFunctionOptionalAnyArg_h