V8 Binding: Introduce toNativeWithTypeCheck

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 3eea35f099a68e940e7deb32112320757259988c..23b23c80d66ff85f7306a6e1e280f228c19a88cd 100644
--- a/Source/bindings/tests/results/V8TestTypedefs.cpp
+++ b/Source/bindings/tests/results/V8TestTypedefs.cpp
@@ -484,6 +484,11 @@ bool V8TestTypedefs::hasInstance(v8::Handle<v8::Value> jsValue, v8::Isolate* iso
         || V8PerIsolateData::from(isolate)->hasInstanceInNonMainWorld(&wrapperTypeInfo, jsValue);
 }
 
+TestTypedefs* V8TestTypedefs::toNativeWithTypeCheck(v8::Isolate* isolate, v8::Handle<v8::Value> value)
+{
+    return hasInstance(value, isolate) ? fromInternalPointer(v8::Handle<v8::Object>::Cast(value)->GetAlignedPointerFromInternalField(v8DOMWrapperObjectIndex)) : 0;
+}
+
 v8::Handle<v8::Object> V8TestTypedefs::createWrapper(PassRefPtr<TestTypedefs> impl, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
 {
     ASSERT(impl);