add GetOwnPropertyDescriptor to api

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index 7c484de53ee1e537a8abeefdce1e0cab69e4952e..e5ed581aaeece9936220d7b740d969cfa89e68f7 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -3205,6 +3205,26 @@ PropertyAttribute v8::Object::GetPropertyAttributes(v8::Handle<Value> key) {
 }
 
 
+Local<Value> v8::Object::GetOwnPropertyDescriptor(Local<String> key) {
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
+  ON_BAILOUT(isolate, "v8::Object::GetOwnPropertyDescriptor()",
+             return Local<Value>());
+  ENTER_V8(isolate);
+  i::Handle<i::JSObject> obj = Utils::OpenHandle(this);
+  i::Handle<i::Name> key_name = Utils::OpenHandle(*key);
+  i::Handle<i::Object> args[] = { obj, key_name };
+  EXCEPTION_PREAMBLE(isolate);
+  i::Handle<i::Object> result;
+  has_pending_exception = !CallV8HeapFunction(
+      "ObjectGetOwnPropertyDescriptor",
+      isolate->factory()->undefined_value(),
+      ARRAY_SIZE(args),
+      args).ToHandle(&result);
+  EXCEPTION_BAILOUT_CHECK(isolate, Local<Value>());
+  return Utils::ToLocal(result);
+}
+
+
 Local<Value> v8::Object::GetPrototype() {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   ON_BAILOUT(isolate, "v8::Object::GetPrototype()", return Local<v8::Value>());