[es6] Partially implement Reflect.ownKeys.

src/builtins.cc

Index: src/builtins.cc
diff --git a/src/builtins.cc b/src/builtins.cc
index 360f12e71584920103f9fbe845b8515dd4b00c28..1371edb99fdf777cac8d6b5e4b3d2dba7445839b 100644
--- a/src/builtins.cc
+++ b/src/builtins.cc
@@ -1640,6 +1640,28 @@ BUILTIN(ReflectIsExtensible) {
 }
 
 
+// ES6 section 26.1.11 Reflect.ownKeys
+BUILTIN(ReflectOwnKeys) {
+  HandleScope scope(isolate);
+  DCHECK_EQ(2, args.length());
+  Handle<Object> target = args.at<Object>(1);
+
+  if (!target->IsJSReceiver()) {
+    THROW_NEW_ERROR_RETURN_FAILURE(
+        isolate, NewTypeError(MessageTemplate::kCalledOnNonObject,
+                              isolate->factory()->NewStringFromAsciiChecked(
+                                  "Reflect.ownKeys")));
+  }
+
+  Handle<FixedArray> keys;
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+      isolate, keys, JSReceiver::GetKeys(Handle<JSReceiver>::cast(target),
+                                         JSReceiver::OWN_ONLY, INCLUDE_SYMBOLS,
+                                         CONVERT_TO_STRING, false));
+  return *isolate->factory()->NewJSArrayWithElements(keys);
+}
+
+
 // ES6 section 26.1.12 Reflect.preventExtensions
 BUILTIN(ReflectPreventExtensions) {
   HandleScope scope(isolate);