Add markPromiseAsHandled V8 extra util

test/cctest/test-api.cc

Index: test/cctest/test-api.cc
diff --git a/test/cctest/test-api.cc b/test/cctest/test-api.cc
index 354db4344f98c403665a0bd0a4e6b3c1ff69d4ee..437848b8c05f451fdcf802d4730ede607691e59a 100644
--- a/test/cctest/test-api.cc
+++ b/test/cctest/test-api.cc
@@ -25396,6 +25396,12 @@ TEST(ExtrasUtilsObject) {
   rejected_promise->Catch(env.local(), store).ToLocalChecked();
   isolate->RunMicrotasks();
   CHECK_EQ(3, CompileRun("result")->Int32Value(env.local()).FromJust());
+
+  auto rejected_but_handled_promise =
+      result->Get(env.local(), v8_str("rejectedButHandledPromise"))
+          .ToLocalChecked()
+          .As<v8::Promise>();
+  CHECK_EQ(true, rejected_but_handled_promise->HasHandler());
 }