[promises] Port ResolvePromise to TF

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index b435826f9a3e2321980382bf1c7038d7bb0e55bb..cca5903ee3816e111eb3e85fa114587da1625c7e 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -7238,8 +7238,11 @@ bool Promise::HasHandler() {
   i::Isolate* isolate = promise->GetIsolate();
   LOG_API(isolate, Promise, HasRejectHandler);
   ENTER_V8(isolate);
-  i::Handle<i::Symbol> key = isolate->factory()->promise_has_handler_symbol();
-  return i::JSReceiver::GetDataProperty(promise, key)->IsTrue(isolate);
+  if (promise->IsJSPromise()) {
+    i::Handle<i::JSPromise> js_promise = i::Handle<i::JSPromise>::cast(promise);
+    return js_promise->has_handler() == 1;

[Igor Sheludko, 2016/12/07 16:23:52]

Suggestion: != 0 would probably be nicer here. Or a named constant.

[gsathya, 2016/12/08 05:18:14]

Done.

+  }
+  return false;
 }