Add GetPropertyAttribute method for Object in the API

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index fca7fbf29b6447092f7bdfdfd7461d85b2287655..2446ee6738d1c970efdda5053c00bdeb754c1f91 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -2794,6 +2794,21 @@ Local<Value> v8::Object::Get(uint32_t index) {
 }
 
 
+PropertyAttribute v8::Object::GetPropertyAttributes(v8::Handle<Value> key) {
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
+  ON_BAILOUT(isolate, "v8::Object::GetPropertyAttribute()",
+             return static_cast<PropertyAttribute>(NONE));
+  ENTER_V8(isolate);
+  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
+  i::Handle<i::Object> key_obj = Utils::OpenHandle(*key);
+  EXCEPTION_PREAMBLE(isolate);
+  PropertyAttributes result =
+      i::GetPropertyAttribute(self, key_obj, &has_pending_exception);
+  EXCEPTION_BAILOUT_CHECK(isolate, static_cast<PropertyAttribute>(NONE));
+  return static_cast<PropertyAttribute>(result);
+}
+
+
 Local<Value> v8::Object::GetPrototype() {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   ON_BAILOUT(isolate, "v8::Object::GetPrototype()",