SemanticsHandle should dispatch creation and disposal events. (flutter#137960)

Author: ksokolovskyi

packages/flutter/lib/src/rendering/object.dart

@@ -822,6 +822,16 @@ typedef LayoutCallback<T extends Constraints> = void Function(T constraints);
 class _LocalSemanticsHandle implements SemanticsHandle {
   _LocalSemanticsHandle._(PipelineOwner owner, this.listener)
       : _owner = owner {
+    // TODO(polina-c): stop duplicating code across disposables
+    // https://github.com/flutter/flutter/issues/137435
+    if (kFlutterMemoryAllocationsEnabled) {
+      MemoryAllocations.instance.dispatchObjectCreated(
+        library: 'package:flutter/rendering.dart',
+        className: '$_LocalSemanticsHandle',
+        object: this,
+      );
+    }
+
     if (listener != null) {
       _owner.semanticsOwner!.addListener(listener!);
     }
@@ -834,6 +844,12 @@ class _LocalSemanticsHandle implements SemanticsHandle {
 
   @override
   void dispose() {
+    // TODO(polina-c): stop duplicating code across disposables
+    // https://github.com/flutter/flutter/issues/137435
+    if (kFlutterMemoryAllocationsEnabled) {
+      MemoryAllocations.instance.dispatchObjectDisposed(object: this);
+    }
+
     if (listener != null) {
       _owner.semanticsOwner!.removeListener(listener!);
     }

packages/flutter/lib/src/semantics/binding.dart

@@ -191,7 +191,17 @@ mixin SemanticsBinding on BindingBase {
 ///
 /// To obtain a [SemanticsHandle], call [SemanticsBinding.ensureSemantics].
 class SemanticsHandle {
-  SemanticsHandle._(this._onDispose);
+  SemanticsHandle._(this._onDispose) {
+    // TODO(polina-c): stop duplicating code across disposables
+    // https://github.com/flutter/flutter/issues/137435
+    if (kFlutterMemoryAllocationsEnabled) {
+      MemoryAllocations.instance.dispatchObjectCreated(
+        library: 'package:flutter/semantics.dart',
+        className: '$SemanticsHandle',
+        object: this,
+      );
+    }
+  }
 
   final VoidCallback _onDispose;
 
@@ -201,6 +211,12 @@ class SemanticsHandle {
   /// framework will stop generating semantics information.
   @mustCallSuper
   void dispose() {
+    // TODO(polina-c): stop duplicating code across disposables
+    // https://github.com/flutter/flutter/issues/137435
+    if (kFlutterMemoryAllocationsEnabled) {
+      MemoryAllocations.instance.dispatchObjectDisposed(object: this);
+    }
+
     _onDispose();
   }
 }

packages/flutter/test/semantics/semantics_binding_test.dart

@@ -82,4 +82,14 @@ void main() {
     expect(SemanticsBinding.instance.semanticsEnabled, isFalse);
     expect(tester.binding.pipelineOwner.semanticsOwner, isNull);
   }, semanticsEnabled: false);
+
+  test('SemanticsHandle dispatches memory events', () async {
+    await expectLater(
+      await memoryEvents(
+        () => SemanticsBinding.instance.ensureSemantics().dispose(),
+        SemanticsHandle,
+      ),
+      areCreateAndDispose,
+    );
+  });
 }