Add support for nullable operation arguments in IDL files

Source/bindings/tests/results/V8TestTypedefs.cpp

 /*
     This file is part of the Blink open source project.
     This file has been auto-generated by CodeGeneratorV8.pm. DO NOT MODIFY!
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
     License as published by the Free Software Foundation; either
     version 2 of the License, or (at your option) any later version.
 
     This library is distributed in the hope that it will be useful,
@@ skipping 324 matching lines @@
     TRACE_EVENT_SET_SAMPLING_STATE("V8", "Execution");
 }
 
 static void nullableArrayArgMethod(const v8::FunctionCallbackInfo<v8::Value>& args)
 {
     if (UNLIKELY(args.Length() < 1)) {
         throwTypeError(ExceptionMessages::failedToExecute("nullableArrayArg", "TestTypedefs", ExceptionMessages::notEnoughArguments(1, args.Length())), args.GetIsolate());
         return;
     }
     TestTypedefs* imp = V8TestTypedefs::toNative(args.Holder());
+    bool arrayArgIsNull = args[0]->IsNull();
     V8TRYCATCH_VOID(Vector<String>, arrayArg, toNativeArray<String>(args[0], args.GetIsolate()));
-    imp->nullableArrayArg(arrayArg);
+    imp->nullableArrayArg(arrayArgIsNull ? 0 : &arrayArg);
 
     return;
 }
 
 static void nullableArrayArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& args)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("Blink", "DOMMethod");
     TestTypedefsV8Internal::nullableArrayArgMethod(args);
     TRACE_EVENT_SET_SAMPLING_STATE("V8", "Execution");
 }
@@ skipping 235 matching lines @@
     V8DOMWrapper::associateObjectWithWrapper<V8TestTypedefs>(impl, &info, wrapper, isolate, WrapperConfiguration::Independent);
     return wrapper;
 }
 
 void V8TestTypedefs::derefObject(void* object)
 {
     fromInternalPointer(object)->deref();
 }
 
 } // namespace WebCore