V8 Binding: Introduce toNativeWithTypeCheck

Source/bindings/tests/results/V8TestInterfaceDocument.cpp

Index: Source/bindings/tests/results/V8TestInterfaceDocument.cpp
diff --git a/Source/bindings/tests/results/V8TestInterfaceDocument.cpp b/Source/bindings/tests/results/V8TestInterfaceDocument.cpp
index fdd70606352f5403f060e4e8a0bf746755c799b9..275ad5e4c44eac6583d2187c0155b1d2ce8b17de 100644
--- a/Source/bindings/tests/results/V8TestInterfaceDocument.cpp
+++ b/Source/bindings/tests/results/V8TestInterfaceDocument.cpp
@@ -114,6 +114,11 @@ bool V8TestInterfaceDocument::hasInstance(v8::Handle<v8::Value> jsValue, v8::Iso
         || V8PerIsolateData::from(isolate)->hasInstanceInNonMainWorld(&wrapperTypeInfo, jsValue);
 }
 
+TestInterfaceDocument* V8TestInterfaceDocument::toNativeWithTypeCheck(v8::Isolate* isolate, v8::Handle<v8::Value> value)
+{
+    return hasInstance(value, isolate) ? fromInternalPointer(v8::Handle<v8::Object>::Cast(value)->GetAlignedPointerFromInternalField(v8DOMWrapperObjectIndex)) : 0;
+}
+
 EventTarget* V8TestInterfaceDocument::toEventTarget(v8::Handle<v8::Object> object)
 {
     return toNative(object);