RestorationManager should dispatch creation in constructor. (#133911)

packages/flutter/lib/src/services/restoration.dart

@@ -154,6 +154,9 @@ class RestorationManager extends ChangeNotifier {
   /// Construct the restoration manager and set up the communications channels
   /// with the engine to get restoration messages (by calling [initChannels]).
   RestorationManager() {
+    if (kFlutterMemoryAllocationsEnabled) {
+      maybeDispatchObjectCreation();
+    }
     initChannels();
   }
 

packages/flutter/test/services/restoration_test.dart

@@ -8,10 +8,15 @@ import 'package:flutter/scheduler.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter/widgets.dart';
 import 'package:flutter_test/flutter_test.dart';
+import 'package:leak_tracker_flutter_testing/leak_tracker_flutter_testing.dart';
 
 import 'restoration.dart';
 
 void main() {
+  testWidgetsWithLeakTracking('$RestorationManager dispatches memory events', (WidgetTester tester) async {
+    expect(() => RestorationManager().dispose(), dispatchesMemoryEvents(RestorationManager));
+  });
+
   group('RestorationManager', () {
     testWidgets('root bucket retrieval', (WidgetTester tester) async {
       final List<MethodCall> callsToEngine = <MethodCall>[];