IDL: Further improve indexed/named property setter type checking

Source/bindings/tests/results/core/V8TestSpecialOperations.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file has been auto-generated by code_generator_v8.py. DO NOT MODIFY!
 
 #include "config.h"
 #include "V8TestSpecialOperations.h"
 
 #include "bindings/core/v8/ExceptionState.h"
@@ skipping 70 matching lines @@
 }
 
 static void namedPropertySetter(v8::Local<v8::Name> name, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     if (!name->IsString())
         return;
     auto nameString = name.As<v8::String>();
     TestSpecialOperations* impl = V8TestSpecialOperations::toImpl(info.Holder());
     TOSTRING_VOID(V8StringResource<>, propertyName, nameString);
     Node* propertyValue = V8Node::toImplWithTypeCheck(info.GetIsolate(), v8Value);
+    if (!propertyValue && !isUndefinedOrNull(v8Value)) {
+        exceptionState.throwTypeError("The provided value is not of type 'Node'.");
+        exceptionState.throwIfNeeded();
+        return;
+    }
     bool result = impl->anonymousNamedSetter(propertyName, propertyValue);
     if (!result)
         return;
     v8SetReturnValue(info, v8Value);
 }
 
 static void namedPropertySetterCallback(v8::Local<v8::Name> name, v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMNamedProperty");
     TestSpecialOperationsV8Internal::namedPropertySetter(name, v8Value, info);
@@ skipping 93 matching lines @@
 {
     scriptWrappable->toImpl<TestSpecialOperations>()->ref();
 }
 
 void V8TestSpecialOperations::derefObject(ScriptWrappable* scriptWrappable)
 {
     scriptWrappable->toImpl<TestSpecialOperations>()->deref();
 }
 
 } // namespace blink