Revert "Revert "Finalize reachable weak persistent handles at isolate shutdown.""

runtime/vm/dart_api_impl_test.cc

Index: runtime/vm/dart_api_impl_test.cc
diff --git a/runtime/vm/dart_api_impl_test.cc b/runtime/vm/dart_api_impl_test.cc
index 511ef579d0613f49cb6eae1bccf6b271bb07d77f..ce86fe07d97a2cf2f3f13163b332e26f8134b861 100644
--- a/runtime/vm/dart_api_impl_test.cc
+++ b/runtime/vm/dart_api_impl_test.cc
@@ -1438,6 +1438,19 @@ TEST_CASE(WeakPersistentHandleCallback) {
 }
 
 
+UNIT_TEST_CASE(WeakPersistentHandlesCallbackShutdown) {
+  TestCase::CreateTestIsolate();
+  Dart_EnterScope();
+  Dart_Handle ref = Dart_True();
+  int peer = 1234;
+  Dart_NewWeakPersistentHandle(ref,
+                               &peer,
+                               WeakPersistentHandlePeerFinalizer);
+  Dart_ShutdownIsolate();
+  EXPECT(peer == 42);
+}
+
+
 TEST_CASE(ObjectGroups) {
   Dart_Handle strong = Dart_Null();
   EXPECT(Dart_IsNull(strong));