[es6] Implement spec compliant ToName (actually ToPropertyKey).

src/runtime/runtime-object.cc

Index: src/runtime/runtime-object.cc
diff --git a/src/runtime/runtime-object.cc b/src/runtime/runtime-object.cc
index e493118ae097b0670488b78b4a743a1b17d70cec..cb5b3b685a6e1168ef92770def9b6dd3fd9262c7 100644
--- a/src/runtime/runtime-object.cc
+++ b/src/runtime/runtime-object.cc
@@ -756,9 +756,12 @@ RUNTIME_FUNCTION(Runtime_HasProperty) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 2);
   CONVERT_ARG_HANDLE_CHECKED(JSReceiver, receiver, 0);
-  CONVERT_ARG_HANDLE_CHECKED(Name, key, 1);
+  CONVERT_ARG_HANDLE_CHECKED(Object, key, 1);
 
-  Maybe<bool> maybe = JSReceiver::HasProperty(receiver, key);
+  Handle<Name> name;
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, name,
+                                     Object::ToName(isolate, key));
+  Maybe<bool> maybe = JSReceiver::HasProperty(receiver, name);
   if (!maybe.IsJust()) return isolate->heap()->exception();
   return isolate->heap()->ToBoolean(maybe.FromJust());
 }
@@ -1481,6 +1484,17 @@ RUNTIME_FUNCTION(Runtime_ToNumber) {
 }
 
 
+RUNTIME_FUNCTION(Runtime_ToName) {
+  HandleScope scope(isolate);
+  DCHECK_EQ(1, args.length());
+  CONVERT_ARG_HANDLE_CHECKED(Object, input, 0);
+  Handle<Object> result;
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result,
+                                     Object::ToName(isolate, input));
+  return *result;
+}
+
+
 RUNTIME_FUNCTION(Runtime_StrictEquals) {
   SealHandleScope scope(isolate);
   DCHECK_EQ(2, args.length());