IDL: make optional arguments (without default) explicit sometimes

Source/bindings/tests/results/V8TestTypedefs.cpp

Index: Source/bindings/tests/results/V8TestTypedefs.cpp
diff --git a/Source/bindings/tests/results/V8TestTypedefs.cpp b/Source/bindings/tests/results/V8TestTypedefs.cpp
index 68ae81945e895ec8c0ed50ccf1e8181b151fe4ff..d67786e854128070c146e5b874e64cce6f201784 100644
--- a/Source/bindings/tests/results/V8TestTypedefs.cpp
+++ b/Source/bindings/tests/results/V8TestTypedefs.cpp
@@ -8,6 +8,7 @@
 #include "V8TestTypedefs.h"
 
 #include "bindings/core/v8/ExceptionState.h"
+#include "bindings/core/v8/Optional.h"
 #include "bindings/core/v8/V8DOMConfiguration.h"
 #include "bindings/core/v8/V8HiddenValue.h"
 #include "bindings/core/v8/V8ObjectConstructor.h"
@@ -101,16 +102,17 @@ static void voidMethodArrayOfLongsArgMethod(const v8::FunctionCallbackInfo<v8::V
 {
     TestTypedefs* impl = V8TestTypedefs::toNative(info.Holder());
     Vector<int> arrayOfLongsArg;
+    bool arrayOfLongsArgMissing = false;
     {
         v8::TryCatch block;
         V8RethrowTryCatchScope rethrow(block);
-        if (UNLIKELY(info.Length() <= 0)) {
-            impl->voidMethodArrayOfLongsArg();
-            return;
+        if (!info[0]->IsUndefined()) {
+            TONATIVE_VOID_INTERNAL(arrayOfLongsArg, toNativeArray<int>(info[0], 1, info.GetIsolate()));
+        } else {
+            arrayOfLongsArgMissing = true;
         }
-        TONATIVE_VOID_INTERNAL(arrayOfLongsArg, toNativeArray<int>(info[0], 1, info.GetIsolate()));
     }
-    impl->voidMethodArrayOfLongsArg(arrayOfLongsArg);
+    impl->voidMethodArrayOfLongsArg(Optional<Vector<int> >(arrayOfLongsArg, arrayOfLongsArgMissing));
 }
 
 static void voidMethodArrayOfLongsArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)