PlatformRouteInformationProvider should dispatch creation in constructor. (#133492)

Author: polina-c

packages/flutter/lib/src/widgets/router.dart

@@ -1465,7 +1465,11 @@ class PlatformRouteInformationProvider extends RouteInformationProvider with Wid
   /// provider.
   PlatformRouteInformationProvider({
     required RouteInformation initialRouteInformation,
-  }) : _value = initialRouteInformation;
+  }) : _value = initialRouteInformation {
+    if (kFlutterMemoryAllocationsEnabled) {
+      maybeDispatchObjectCreation();
+    }
+  }
 
   static bool _equals(Uri a, Uri b) {
     return a.path == b.path

packages/flutter/test/material/app_test.dart

@@ -1161,6 +1161,7 @@ void main() {
       routerDelegate: delegate,
     ));
     expect(tester.takeException(), isAssertionError);
+    provider.dispose();
   });
 
   testWidgetsWithLeakTracking('MaterialApp.router throw if route configuration is provided along with other delegate', (WidgetTester tester) async {

packages/flutter/test/widgets/router_test.dart

@@ -1582,6 +1582,21 @@ testWidgets('ChildBackButtonDispatcher take priority recursively', (WidgetTester
       expect(info2.location, '/abc?def=ghi&def=jkl#mno');
     });
   });
+
+  test('$PlatformRouteInformationProvider dispatches object creation in constructor', () {
+    int eventCount = 0;
+    void listener(ObjectEvent event) => eventCount++;
+    MemoryAllocations.instance.addListener(listener);
+
+    final PlatformRouteInformationProvider registry = PlatformRouteInformationProvider(
+      initialRouteInformation: RouteInformation(uri: Uri.parse('http://google.com')),
+    );
+
+    expect(eventCount, 1);
+
+    registry.dispose();
+    MemoryAllocations.instance.removeListener(listener);
+  });
 }
 
 Widget buildBoilerPlate(Widget child) {