Clean up leak tracker instrumentation tech debt. (#164070)

Fixes https://github.com/flutter/flutter/issues/137435

Tests are not needed because it is refactoring. Requested
[exempt](https://discord.com/channels/608014603317936148/608018585025118217/1343801945982505001).

@goderbauer , if looks good, can you merge it please, to avoid
conflicts, as there are many files here?

packages/flutter/lib/src/animation/animation_controller.dart

@@ -23,8 +23,6 @@ export 'package:flutter/scheduler.dart' show TickerFuture, TickerProvider;
 export 'animation.dart' show Animation, AnimationStatus;
 export 'curves.dart' show Curve;
 
-const String _flutterAnimationLibrary = 'package:flutter/animation.dart';
-
 // Examples can assume:
 // late AnimationController _controller, fadeAnimationController, sizeAnimationController;
 // late bool dismissed;
@@ -255,9 +253,7 @@ class AnimationController extends Animation<double>
     required TickerProvider vsync,
   }) : assert(upperBound >= lowerBound),
        _direction = _AnimationDirection.forward {
-    if (kFlutterMemoryAllocationsEnabled) {
+    assert(debugMaybeDispatchCreated('animation', 'AnimationController', this));
-      _maybeDispatchObjectCreation();
-    }
     _ticker = vsync.createTicker(_tick);
     _internalSetValue(value ?? lowerBound);
   }
@@ -289,24 +285,11 @@ class AnimationController extends Animation<double>
   }) : lowerBound = double.negativeInfinity,
        upperBound = double.infinity,
        _direction = _AnimationDirection.forward {
-    if (kFlutterMemoryAllocationsEnabled) {
+    assert(debugMaybeDispatchCreated('animation', 'AnimationController', this));
-      _maybeDispatchObjectCreation();
-    }
     _ticker = vsync.createTicker(_tick);
     _internalSetValue(value);
   }
 
-  /// Dispatches event of object creation to [FlutterMemoryAllocations.instance].
-  void _maybeDispatchObjectCreation() {
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: _flutterAnimationLibrary,
-        className: '$AnimationController',
-        object: this,
-      );
-    }
-  }
-
   /// The value at which this animation is deemed to be dismissed.
   final double lowerBound;
 
@@ -946,9 +929,7 @@ class AnimationController extends Animation<double>
       }
       return true;
     }());
-    if (kFlutterMemoryAllocationsEnabled) {
+    assert(debugMaybeDispatchDisposed(this));
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
     _ticker!.dispose();
     _ticker = null;
     clearStatusListeners();

packages/flutter/lib/src/animation/animations.dart

@@ -505,15 +505,7 @@ class TrainHoppingAnimation extends Animation<double>
     this._nextTrain, {
     this.onSwitchedTrain,
   }) {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchCreated('animation', 'TrainHoppingAnimation', this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: 'package:flutter/animation.dart',
-        className: '$TrainHoppingAnimation',
-        object: this,
-      );
-    }
     if (_nextTrain != null) {
       if (_currentTrain!.value == _nextTrain!.value) {
         _currentTrain = _nextTrain;
@@ -598,11 +590,7 @@ class TrainHoppingAnimation extends Animation<double>
   /// After this is called, this object is no longer usable.
   @override
   void dispose() {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchDisposed(this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
     assert(_currentTrain != null);
     _currentTrain!.removeStatusListener(_statusChangeHandler);
     _currentTrain!.removeListener(_valueChangeHandler);

packages/flutter/lib/src/foundation/change_notifier.dart

@@ -11,6 +11,7 @@ import 'dart:ui' show VoidCallback;
 import 'package:meta/meta.dart';
 
 import 'assertions.dart';
+import 'debug.dart';
 import 'diagnostics.dart';
 import 'memory_allocations.dart';
 
@@ -100,8 +101,6 @@ abstract class ValueListenable<T> extends Listenable {
   T get value;
 }
 
-const String _flutterFoundationLibrary = 'package:flutter/foundation.dart';
-
 /// A class that can be extended or mixed in that provides a change notification
 /// API using [VoidCallback] for notifications.
 ///
@@ -156,7 +155,7 @@ mixin class ChangeNotifier implements Listenable {
   ///
   /// As [ChangeNotifier] is used as mixin, it does not have constructor,
   /// so we use [addListener] to dispatch the event.
-  bool _creationDispatched = false;
+  bool _debugCreationDispatched = false;
 
   /// Used by subclasses to assert that the [ChangeNotifier] has not yet been
   /// disposed.
@@ -232,16 +231,13 @@ mixin class ChangeNotifier implements Listenable {
   /// so that the method is tree-shaken away when the flag is false.
   @protected
   static void maybeDispatchObjectCreation(ChangeNotifier object) {
-    // Tree shaker does not include this method and the class MemoryAllocations
+    assert(() {
-    // if kFlutterMemoryAllocationsEnabled is false.
+      if (!object._debugCreationDispatched) {
-    if (kFlutterMemoryAllocationsEnabled && !object._creationDispatched) {
+        debugMaybeDispatchCreated('foundation', 'ChangeNotifier', object);
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
+        object._debugCreationDispatched = true;
-        library: _flutterFoundationLibrary,
+      }
-        className: '$ChangeNotifier',
+      return true;
-        object: object,
+    }());
-      );
-      object._creationDispatched = true;
-    }
   }
 
   /// Register a closure to be called when the object changes.
@@ -387,11 +383,11 @@ mixin class ChangeNotifier implements Listenable {
     );
     assert(() {
       _debugDisposed = true;
+      if (_debugCreationDispatched) {
+        assert(debugMaybeDispatchDisposed(this));
+      }
       return true;
     }());
-    if (kFlutterMemoryAllocationsEnabled && _creationDispatched) {
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
     _listeners = _emptyListeners;
     _count = 0;
   }

packages/flutter/lib/src/gestures/multidrag.dart

@@ -39,15 +39,7 @@ abstract class MultiDragPointerState {
   /// Creates per-pointer state for a [MultiDragGestureRecognizer].
   MultiDragPointerState(this.initialPosition, this.kind, this.gestureSettings)
     : _velocityTracker = VelocityTracker.withKind(kind) {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchCreated('gestures', 'MultiDragPointerState', this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: 'package:flutter/gestures.dart',
-        className: '$MultiDragPointerState',
-        object: this,
-      );
-    }
   }
 
   /// Device specific gesture configuration that should be preferred over
@@ -195,11 +187,7 @@ abstract class MultiDragPointerState {
   @protected
   @mustCallSuper
   void dispose() {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchDisposed(this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
     _arenaEntry?.resolve(GestureDisposition.rejected);
     _arenaEntry = null;
     assert(() {

packages/flutter/lib/src/gestures/recognizer.dart

@@ -142,15 +142,7 @@ abstract class GestureRecognizer extends GestureArenaMember with DiagnosticableT
     this.supportedDevices,
     this.allowedButtonsFilter = _defaultButtonAcceptBehavior,
   }) {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchCreated('gestures', 'GestureRecognizer', this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: 'package:flutter/gestures.dart',
-        className: '$GestureRecognizer',
-        object: this,
-      );
-    }
   }
 
   /// The recognizer's owner.
@@ -313,11 +305,7 @@ abstract class GestureRecognizer extends GestureArenaMember with DiagnosticableT
   /// GestureDetector widget calls this method).
   @mustCallSuper
   void dispose() {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchDisposed(this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
   }
 
   /// Returns a very short pretty description of the gesture that the

packages/flutter/lib/src/material/material.dart

@@ -677,15 +677,7 @@ abstract class InkFeature {
     required this.referenceBox,
     this.onRemoved,
   }) : _controller = controller as _RenderInkFeatures {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchCreated('material', 'InkFeature', this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: 'package:flutter/material.dart',
-        className: '$InkFeature',
-        object: this,
-      );
-    }
   }
 
   /// The [MaterialInkController] associated with this [InkFeature].
@@ -711,11 +703,7 @@ abstract class InkFeature {
       _debugDisposed = true;
       return true;
     }());
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchDisposed(this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
     _controller._removeFeature(this);
     onRemoved?.call();
   }

packages/flutter/lib/src/material/mergeable_material.dart

@@ -146,15 +146,7 @@ class _AnimationTuple {
     required this.endAnimation,
     required this.gapAnimation,
   }) {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchCreated('material', '_AnimationTuple', this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: 'package:flutter/material.dart',
-        className: '$_AnimationTuple',
-        object: this,
-      );
-    }
   }
 
   final AnimationController controller;
@@ -165,9 +157,7 @@ class _AnimationTuple {
 
   @mustCallSuper
   void dispose() {
-    if (kFlutterMemoryAllocationsEnabled) {
+    assert(debugMaybeDispatchDisposed(this));
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
     controller.dispose();
     startAnimation.dispose();
     endAnimation.dispose();

packages/flutter/lib/src/material/tabs.dart

@@ -480,15 +480,7 @@ class _IndicatorPainter extends CustomPainter {
     required this.indicatorAnimation,
     required this.textDirection,
   }) : super(repaint: controller.animation) {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchCreated('material', '_IndicatorPainter', this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: 'package:flutter/material.dart',
-        className: '$_IndicatorPainter',
-        object: this,
-      );
-    }
     if (old != null) {
       saveTabOffsets(old._currentTabOffsets, old._currentTextDirection);
     }
@@ -521,9 +513,7 @@ class _IndicatorPainter extends CustomPainter {
   }
 
   void dispose() {
-    if (kFlutterMemoryAllocationsEnabled) {
+    assert(debugMaybeDispatchDisposed(this));
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
     _painter?.dispose();
   }
 

packages/flutter/lib/src/material/time_picker.dart

@@ -957,15 +957,7 @@ class _DialPainter extends CustomPainter {
     required this.textDirection,
     required this.selectedValue,
   }) : super(repaint: PaintingBinding.instance.systemFonts) {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchCreated('material', '_DialPainter', this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: 'package:flutter/material.dart',
-        className: '$_DialPainter',
-        object: this,
-      );
-    }
   }
 
   final List<_TappableLabel> primaryLabels;
@@ -982,9 +974,7 @@ class _DialPainter extends CustomPainter {
   final int selectedValue;
 
   void dispose() {
-    if (kFlutterMemoryAllocationsEnabled) {
+    assert(debugMaybeDispatchDisposed(this));
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
     for (final _TappableLabel label in primaryLabels) {
       label.painter.dispose();
     }

packages/flutter/lib/src/painting/decoration_image.dart

@@ -319,15 +319,7 @@ abstract interface class DecorationImagePainter {
 
 class _DecorationImagePainter implements DecorationImagePainter {
   _DecorationImagePainter._(this._details, this._onChanged) {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchCreated('painting', '_DecorationImagePainter', this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: 'package:flutter/painting.dart',
-        className: '$_DecorationImagePainter',
-        object: this,
-      );
-    }
   }
 
   final DecorationImage _details;
@@ -438,9 +430,7 @@ class _DecorationImagePainter implements DecorationImagePainter {
 
   @override
   void dispose() {
-    if (kFlutterMemoryAllocationsEnabled) {
+    assert(debugMaybeDispatchDisposed(this));
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
     _imageStream?.removeListener(ImageStreamListener(_handleImage, onError: _details.onError));
     _image?.dispose();
     _image = null;
@@ -862,15 +852,7 @@ class _BlendedDecorationImage implements DecorationImage {
 
 class _BlendedDecorationImagePainter implements DecorationImagePainter {
   _BlendedDecorationImagePainter._(this.a, this.b, this.t) {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchCreated('painting', '_BlendedDecorationImagePainter', this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: 'package:flutter/painting.dart',
-        className: '$_BlendedDecorationImagePainter',
-        object: this,
-      );
-    }
   }
 
   final DecorationImagePainter? a;
@@ -901,9 +883,7 @@ class _BlendedDecorationImagePainter implements DecorationImagePainter {
 
   @override
   void dispose() {
-    if (kFlutterMemoryAllocationsEnabled) {
+    assert(debugMaybeDispatchDisposed(this));
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
     a?.dispose();
     b?.dispose();
   }

packages/flutter/lib/src/painting/image_cache.dart

@@ -595,15 +595,7 @@ class ImageCacheStatus {
 /// [ImageCache._cache].
 abstract class _CachedImageBase {
   _CachedImageBase(this.completer, {this.sizeBytes}) : handle = completer.keepAlive() {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchCreated('painting', '_CachedImageBase', this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: 'package:flutter/painting.dart',
-        className: '$_CachedImageBase',
-        object: this,
-      );
-    }
   }
 
   final ImageStreamCompleter completer;
@@ -613,9 +605,7 @@ abstract class _CachedImageBase {
   @mustCallSuper
   void dispose() {
     assert(handle != null);
-    if (kFlutterMemoryAllocationsEnabled) {
+    assert(debugMaybeDispatchDisposed(this));
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
     // Give any interested parties a chance to listen to the stream before we
     // potentially dispose it.
     SchedulerBinding.instance.addPostFrameCallback((Duration timeStamp) {

packages/flutter/lib/src/painting/image_stream.dart

@@ -16,8 +16,6 @@ import 'dart:ui' as ui show Codec, FrameInfo, Image;
 import 'package:flutter/foundation.dart';
 import 'package:flutter/scheduler.dart';
 
-const String _flutterPaintingLibrary = 'package:flutter/painting.dart';
-
 /// A [dart:ui.Image] object with its corresponding scale.
 ///
 /// ImageInfo objects are used by [ImageStream] objects to represent the
@@ -47,13 +45,7 @@ class ImageInfo {
   ///
   /// See details for disposing contract in the class description.
   ImageInfo({required this.image, this.scale = 1.0, this.debugLabel}) {
-    if (kFlutterMemoryAllocationsEnabled) {
+    assert(debugMaybeDispatchCreated('painting', 'ImageInfo', this));
-      MemoryAllocations.instance.dispatchObjectCreated(
-        library: _flutterPaintingLibrary,
-        className: '$ImageInfo',
-        object: this,
-      );
-    }
   }
 
   /// Creates an [ImageInfo] with a cloned [image].
@@ -144,9 +136,7 @@ class ImageInfo {
   /// and no clones of it or the image it contains can be made.
   void dispose() {
     assert((image.debugGetOpenHandleStackTraces()?.length ?? 1) > 0);
-    if (kFlutterMemoryAllocationsEnabled) {
+    assert(debugMaybeDispatchDisposed(this));
-      MemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
     image.dispose();
   }
 
@@ -460,15 +450,7 @@ class ImageStream with Diagnosticable {
 class ImageStreamCompleterHandle {
   ImageStreamCompleterHandle._(ImageStreamCompleter this._completer) {
     _completer!._keepAliveHandles += 1;
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchCreated('painting', 'ImageStreamCompleterHandle', this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: _flutterPaintingLibrary,
-        className: '$ImageStreamCompleterHandle',
-        object: this,
-      );
-    }
   }
 
   ImageStreamCompleter? _completer;
@@ -485,11 +467,7 @@ class ImageStreamCompleterHandle {
     _completer!._keepAliveHandles -= 1;
     _completer!._maybeDispose();
     _completer = null;
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchDisposed(this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
   }
 }
 

packages/flutter/lib/src/painting/text_painter.dart

@@ -561,8 +561,6 @@ class _LineCaretMetrics {
   }
 }
 
-const String _flutterPaintingLibrary = 'package:flutter/painting.dart';
-
 /// An object that paints a [TextSpan] tree into a [Canvas].
 ///
 /// To use a [TextPainter], follow these steps:
@@ -628,15 +626,7 @@ class TextPainter {
        _strutStyle = strutStyle,
        _textWidthBasis = textWidthBasis,
        _textHeightBehavior = textHeightBehavior {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchCreated('painting', 'TextPainter', this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: _flutterPaintingLibrary,
-        className: '$TextPainter',
-        object: this,
-      );
-    }
   }
 
   /// Computes the width of a configured [TextPainter].
@@ -1786,11 +1776,7 @@ class TextPainter {
       _disposed = true;
       return true;
     }());
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchDisposed(this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
     _layoutTemplate?.dispose();
     _layoutTemplate = null;
     _layoutCache?.paragraph.dispose();

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

@@ -80,8 +80,6 @@ class AnnotationResult<T> {
   }
 }
 
-const String _flutterRenderingLibrary = 'package:flutter/rendering.dart';
-
 /// A composited layer.
 ///
 /// During painting, the render tree generates a tree of composited layers that
@@ -146,13 +144,7 @@ const String _flutterRenderingLibrary = 'package:flutter/rendering.dart';
 abstract class Layer with DiagnosticableTreeMixin {
   /// Creates an instance of Layer.
   Layer() {
-    if (kFlutterMemoryAllocationsEnabled) {
+    assert(debugMaybeDispatchCreated('rendering', 'Layer', this));
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: _flutterRenderingLibrary,
-        className: '$Layer',
-        object: this,
-      );
-    }
   }
 
   final Map<int, VoidCallback> _callbacks = <int, VoidCallback>{};
@@ -342,9 +334,7 @@ abstract class Layer with DiagnosticableTreeMixin {
       _debugDisposed = true;
       return true;
     }());
-    if (kFlutterMemoryAllocationsEnabled) {
+    assert(debugMaybeDispatchDisposed(this));
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
     _engineLayer?.dispose();
     _engineLayer = null;
   }

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

@@ -884,16 +884,7 @@ 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
+    assert(debugMaybeDispatchCreated('rendering', '_LocalSemanticsHandle', this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: 'package:flutter/rendering.dart',
-        className: '$_LocalSemanticsHandle',
-        object: this,
-      );
-    }
-
     if (listener != null) {
       _owner.semanticsOwner!.addListener(listener!);
     }
@@ -906,12 +897,7 @@ class _LocalSemanticsHandle implements SemanticsHandle {
 
   @override
   void dispose() {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchDisposed(this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
-
     if (listener != null) {
       _owner.semanticsOwner!.removeListener(listener!);
     }
@@ -974,15 +960,7 @@ base class PipelineOwner with DiagnosticableTreeMixin {
     this.onSemanticsUpdate,
     this.onSemanticsOwnerDisposed,
   }) {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchCreated('rendering', 'PipelineOwner', this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: 'package:flutter/rendering.dart',
-        className: '$PipelineOwner',
-        object: this,
-      );
-    }
   }
 
   /// Called when a render object associated with this pipeline owner wishes to
@@ -1598,9 +1576,7 @@ base class PipelineOwner with DiagnosticableTreeMixin {
     assert(rootNode == null);
     assert(_manifold == null);
     assert(_debugParent == null);
-    if (kFlutterMemoryAllocationsEnabled) {
+    assert(debugMaybeDispatchDisposed(this));
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
     _semanticsOwner?.dispose();
     _semanticsOwner = null;
     _nodesNeedingLayout.clear();
@@ -1664,8 +1640,6 @@ abstract class PipelineManifold implements Listenable {
   void requestVisualUpdate();
 }
 
-const String _flutterRenderingLibrary = 'package:flutter/rendering.dart';
-
 /// An object in the render tree.
 ///
 /// The [RenderObject] class hierarchy is the core of the rendering
@@ -1794,13 +1768,7 @@ const String _flutterRenderingLibrary = 'package:flutter/rendering.dart';
 abstract class RenderObject with DiagnosticableTreeMixin implements HitTestTarget {
   /// Initializes internal fields for subclasses.
   RenderObject() {
-    if (kFlutterMemoryAllocationsEnabled) {
+    assert(debugMaybeDispatchCreated('rendering', 'RenderObject', this));
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: _flutterRenderingLibrary,
-        className: '$RenderObject',
-        object: this,
-      );
-    }
     _needsCompositing = isRepaintBoundary || alwaysNeedsCompositing;
     _wasRepaintBoundary = isRepaintBoundary;
   }
@@ -1861,9 +1829,7 @@ abstract class RenderObject with DiagnosticableTreeMixin implements HitTestTarge
   @mustCallSuper
   void dispose() {
     assert(!_debugDisposed);
-    if (kFlutterMemoryAllocationsEnabled) {
+    assert(debugMaybeDispatchDisposed(this));
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
     _layerHandle.layer = null;
     assert(() {
       // TODO(dnfield): Enable this assert once clients have had a chance to

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

@@ -212,15 +212,7 @@ typedef _PerformanceModeCleanupCallback = VoidCallback;
 /// The component that makes the request is responsible for disposing the handle.
 class PerformanceModeRequestHandle {
   PerformanceModeRequestHandle._(_PerformanceModeCleanupCallback this._cleanup) {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchCreated('scheduler', 'PerformanceModeRequestHandle', this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: 'package:flutter/scheduler.dart',
-        className: '$PerformanceModeRequestHandle',
-        object: this,
-      );
-    }
   }
 
   _PerformanceModeCleanupCallback? _cleanup;
@@ -231,11 +223,7 @@ class PerformanceModeRequestHandle {
   /// This method must only be called once per object.
   void dispose() {
     assert(_cleanup != null);
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchDisposed(this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
     _cleanup!();
     _cleanup = null;
   }

packages/flutter/lib/src/scheduler/ticker.dart

@@ -86,15 +86,7 @@ class Ticker {
       _debugCreationStack = StackTrace.current;
       return true;
     }());
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchCreated('scheduler', 'Ticker', this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: 'package:flutter/scheduler.dart',
-        className: '$Ticker',
-        object: this,
-      );
-    }
   }
 
   TickerFuture? _future;
@@ -354,12 +346,7 @@ class Ticker {
   ///    with a [TickerCanceled] error.
   @mustCallSuper
   void dispose() {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchDisposed(this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
-
     if (_future != null) {
       final TickerFuture localFuture = _future!;
       _future = null;

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

@@ -227,15 +227,7 @@ mixin SemanticsBinding on BindingBase {
 /// To obtain a [SemanticsHandle], call [SemanticsBinding.ensureSemantics].
 class SemanticsHandle {
   SemanticsHandle._(this._onDispose) {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchCreated('semantics', 'SemanticsHandle', this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: 'package:flutter/semantics.dart',
-        className: '$SemanticsHandle',
-        object: this,
-      );
-    }
   }
 
   final VoidCallback _onDispose;
@@ -246,12 +238,7 @@ class SemanticsHandle {
   /// framework will stop generating semantics information.
   @mustCallSuper
   void dispose() {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchDisposed(this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
-
     _onDispose();
   }
 }

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

@@ -3761,15 +3761,7 @@ class _TraversalSortNode implements Comparable<_TraversalSortNode> {
 class SemanticsOwner extends ChangeNotifier {
   /// Creates a [SemanticsOwner] that manages zero or more [SemanticsNode] objects.
   SemanticsOwner({required this.onSemanticsUpdate}) {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchCreated('semantics', 'SemanticsOwner', this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: 'package:flutter/semantics.dart',
-        className: '$SemanticsOwner',
-        object: this,
-      );
-    }
   }
 
   /// The [onSemanticsUpdate] callback is expected to dispatch [SemanticsUpdate]s
@@ -3791,9 +3783,7 @@ class SemanticsOwner extends ChangeNotifier {
 
   @override
   void dispose() {
-    if (kFlutterMemoryAllocationsEnabled) {
+    assert(debugMaybeDispatchDisposed(this));
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
     _dirtyNodes.clear();
     _nodes.clear();
     _detachedNodes.clear();

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

@@ -518,9 +518,7 @@ class RestorationBucket {
       _debugOwner = debugOwner;
       return true;
     }());
-    if (kFlutterMemoryAllocationsEnabled) {
+    assert(debugMaybeDispatchCreated('services', 'RestorationBucket', this));
-      _maybeDispatchObjectCreation();
-    }
   }
 
   /// Creates the root [RestorationBucket] for the provided restoration
@@ -554,9 +552,7 @@ class RestorationBucket {
       _debugOwner = manager;
       return true;
     }());
-    if (kFlutterMemoryAllocationsEnabled) {
+    assert(debugMaybeDispatchCreated('services', 'RestorationBucket', this));
-      _maybeDispatchObjectCreation();
-    }
   }
 
   /// Creates a child bucket initialized with the data that the provided
@@ -580,9 +576,7 @@ class RestorationBucket {
       _debugOwner = debugOwner;
       return true;
     }());
-    if (kFlutterMemoryAllocationsEnabled) {
+    assert(debugMaybeDispatchCreated('services', 'RestorationBucket', this));
-      _maybeDispatchObjectCreation();
-    }
   }
 
   static const String _childrenMapKey = 'c';
@@ -961,19 +955,6 @@ class RestorationBucket {
     _parent?._addChildData(this);
   }
 
-  // TODO(polina-c): stop duplicating code across disposables
-  // https://github.com/flutter/flutter/issues/137435
-  /// Dispatches event of object creation to [FlutterMemoryAllocations.instance].
-  void _maybeDispatchObjectCreation() {
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: 'package:flutter/services.dart',
-        className: '$RestorationBucket',
-        object: this,
-      );
-    }
-  }
-
   /// Deletes the bucket and all the data stored in it from the bucket
   /// hierarchy.
   ///
@@ -988,11 +969,7 @@ class RestorationBucket {
   /// This method must only be called by the object's owner.
   void dispose() {
     assert(_debugAssertNotDisposed());
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchDisposed(this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
     _visitChildren(_dropChild, concurrentModification: true);
     _claimedChildren.clear();
     _childrenToAdd.clear();

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

@@ -76,15 +76,7 @@ class AppLifecycleListener with WidgetsBindingObserver, Diagnosticable {
     this.onStateChange,
   }) : binding = binding ?? WidgetsBinding.instance,
        _lifecycleState = (binding ?? WidgetsBinding.instance).lifecycleState {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchCreated('widgets', 'AppLifecycleListener', this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: 'package:flutter/widgets.dart',
-        className: '$AppLifecycleListener',
-        object: this,
-      );
-    }
     this.binding.addObserver(this);
   }
 
@@ -186,11 +178,7 @@ class AppLifecycleListener with WidgetsBindingObserver, Diagnosticable {
   @mustCallSuper
   void dispose() {
     assert(_debugAssertNotDisposed());
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchDisposed(this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
     binding.removeObserver(this);
     assert(() {
       _debugDisposed = true;

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

@@ -29,8 +29,6 @@ const TextStyle _kTextStyle = TextStyle(
   height: 1.0,
 );
 
-const String _flutterWidgetsLibrary = 'package:flutter/widgets.dart';
-
 /// Where to show a [Banner].
 ///
 /// The start and end locations are relative to the ambient [Directionality]
@@ -71,15 +69,7 @@ class BannerPainter extends CustomPainter {
     this.textStyle = _kTextStyle,
     this.shadow = _kShadow,
   }) : super(repaint: PaintingBinding.instance.systemFonts) {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchCreated('widgets', 'BannerPainter', this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: _flutterWidgetsLibrary,
-        className: '$BannerPainter',
-        object: this,
-      );
-    }
   }
 
   /// The message to show in the banner.
@@ -138,11 +128,7 @@ class BannerPainter extends CustomPainter {
   ///
   /// After calling this method, this object is no longer usable.
   void dispose() {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchDisposed(this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
     _textPainter?.dispose();
     _textPainter = null;
   }

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

@@ -34,15 +34,7 @@ class DisposableBuildContext<T extends State> {
         _state.mounted,
         'A DisposableBuildContext was given a BuildContext for an Element that is not mounted.',
       ) {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchCreated('widgets', 'DisposableBuildContext', this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: 'package:flutter/widgets.dart',
-        className: '$DisposableBuildContext',
-        object: this,
-      );
-    }
   }
 
   T? _state;
@@ -77,11 +69,7 @@ class DisposableBuildContext<T extends State> {
   /// Creators of this object must call [dispose] when their [Element] is
   /// unmounted, i.e. when [State.dispose] is called.
   void dispose() {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchDisposed(this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
     _state = null;
   }
 }

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

@@ -510,15 +510,7 @@ class _DraggableSheetExtent {
        availablePixels = double.infinity,
        hasDragged = hasDragged ?? false,
        hasChanged = hasChanged ?? false {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchCreated('widgets', '_DraggableSheetExtent', this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: 'package:flutter/widgets.dart',
-        className: '$_DraggableSheetExtent',
-        object: this,
-      );
-    }
   }
 
   VoidCallback? _cancelActivity;
@@ -615,9 +607,7 @@ class _DraggableSheetExtent {
   }
 
   void dispose() {
-    if (kFlutterMemoryAllocationsEnabled) {
+    assert(debugMaybeDispatchDisposed(this));
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
     _currentSize.dispose();
   }
 

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

@@ -2062,15 +2062,7 @@ class FocusManager with DiagnosticableTreeMixin, ChangeNotifier {
 // value, and ChangeNotifier requires using VoidCallback.
 class _HighlightModeManager {
   _HighlightModeManager() {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchCreated('widgets', '_HighlightModeManager', this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: 'package:flutter/widgets.dart',
-        className: '$_HighlightModeManager',
-        object: this,
-      );
-    }
   }
 
   // If null, no interactions have occurred yet and the default highlight mode for the current
@@ -2136,9 +2128,7 @@ class _HighlightModeManager {
 
   @mustCallSuper
   void dispose() {
-    if (kFlutterMemoryAllocationsEnabled) {
+    assert(debugMaybeDispatchDisposed(this));
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
     if (ServicesBinding.instance.keyEventManager.keyMessageHandler == handleKeyMessage) {
       GestureBinding.instance.pointerRouter.removeGlobalRoute(handlePointerEvent);
       ServicesBinding.instance.keyEventManager.keyMessageHandler = null;

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

@@ -822,8 +822,6 @@ enum _StateLifecycle {
 /// The signature of [State.setState] functions.
 typedef StateSetter = void Function(VoidCallback fn);
 
-const String _flutterWidgetsLibrary = 'package:flutter/widgets.dart';
-
 /// The logic and internal state for a [StatefulWidget].
 ///
 /// State is information that (1) can be read synchronously when the widget is
@@ -1009,13 +1007,7 @@ abstract class State<T extends StatefulWidget> with Diagnosticable {
   @mustCallSuper
   void initState() {
     assert(_debugLifecycleState == _StateLifecycle.created);
-    if (kFlutterMemoryAllocationsEnabled) {
+    assert(debugMaybeDispatchCreated('widgets', 'State', this));
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: _flutterWidgetsLibrary,
-        className: '$State',
-        object: this,
-      );
-    }
   }
 
   /// Called whenever the widget configuration changes.
@@ -1345,9 +1337,7 @@ abstract class State<T extends StatefulWidget> with Diagnosticable {
       _debugLifecycleState = _StateLifecycle.defunct;
       return true;
     }());
-    if (kFlutterMemoryAllocationsEnabled) {
+    assert(debugMaybeDispatchDisposed(this));
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
   }
 
   /// Describes the part of the user interface represented by this widget.
@@ -3513,13 +3503,7 @@ abstract class Element extends DiagnosticableTree implements BuildContext {
   ///
   /// Typically called by an override of [Widget.createElement].
   Element(Widget widget) : _widget = widget {
-    if (kFlutterMemoryAllocationsEnabled) {
+    assert(debugMaybeDispatchCreated('widgets', 'Element', this));
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: _flutterWidgetsLibrary,
-        className: '$Element',
-        object: this,
-      );
-    }
   }
 
   Element? _parent;
@@ -4764,9 +4748,7 @@ abstract class Element extends DiagnosticableTree implements BuildContext {
     assert(_lifecycleState == _ElementLifecycle.inactive);
     assert(_widget != null); // Use the private property to avoid a CastError during hot reload.
     assert(owner != null);
-    if (kFlutterMemoryAllocationsEnabled) {
+    assert(debugMaybeDispatchDisposed(this));
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
     // Use the private property to avoid a CastError during hot reload.
     final Key? key = _widget?.key;
     if (key is GlobalKey) {

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

@@ -518,15 +518,7 @@ class _HeroFlightManifest {
 // Builds the in-flight hero widget.
 class _HeroFlight {
   _HeroFlight(this.onFlightEnded) {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchCreated('widgets', '_HeroFlight', this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: 'package:flutter/widgets.dart',
-        className: '$_HeroFlight',
-        object: this,
-      );
-    }
     _proxyAnimation = ProxyAnimation()..addStatusListener(_handleAnimationUpdate);
   }
 
@@ -633,9 +625,7 @@ class _HeroFlight {
   /// Releases resources.
   @mustCallSuper
   void dispose() {
-    if (kFlutterMemoryAllocationsEnabled) {
+    assert(debugMaybeDispatchDisposed(this));
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
     if (overlayEntry != null) {
       overlayEntry!.remove();
       overlayEntry!.dispose();
@@ -824,15 +814,7 @@ class HeroController extends NavigatorObserver {
   /// The [createRectTween] argument is optional. If null, the controller uses a
   /// linear [Tween<Rect>].
   HeroController({this.createRectTween}) {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchCreated('widgets', 'HeroController', this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: 'package:flutter/widgets.dart',
-        className: '$HeroController',
-        object: this,
-      );
-    }
   }
 
   /// Used to create [RectTween]s that interpolate the position of heroes in flight.
@@ -1106,12 +1088,7 @@ class HeroController extends NavigatorObserver {
   /// Releases resources.
   @mustCallSuper
   void dispose() {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchDisposed(this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
-
     for (final _HeroFlight flight in _flights.values) {
       flight.dispose();
     }

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

@@ -171,13 +171,7 @@ abstract class Route<T> extends _RoutePlaceholder {
   Route({RouteSettings? settings, bool? requestFocus})
     : _settings = settings ?? const RouteSettings(),
       _requestFocus = requestFocus {
-    if (kFlutterMemoryAllocationsEnabled) {
+    assert(debugMaybeDispatchCreated('widgets', 'Route<T>', this));
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: 'package:flutter/widgets.dart',
-        className: '$Route<$T>',
-        object: this,
-      );
-    }
   }
 
   /// When the route state is updated, request focus if the current route is at the top.
@@ -578,9 +572,7 @@ abstract class Route<T> extends _RoutePlaceholder {
     _navigator = null;
     _restorationScopeId.dispose();
     _disposeCompleter.complete();
-    if (kFlutterMemoryAllocationsEnabled) {
+    assert(debugMaybeDispatchDisposed(this));
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
   }
 
   /// Whether this route is the top-most route on the navigator.
@@ -3149,15 +3141,7 @@ class _RouteEntry extends RouteTransitionRecord {
              initialState == _RouteLifecycle.replace,
        ),
        currentState = initialState {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchCreated('widgets', '_RouteEntry', this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: 'package:flutter/widgets.dart',
-        className: '$_RouteEntry',
-        object: this,
-      );
-    }
   }
 
   @override
@@ -3395,11 +3379,7 @@ class _RouteEntry extends RouteTransitionRecord {
   /// before disposing.
   void forcedDispose() {
     assert(currentState.index < _RouteLifecycle.disposed.index);
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchDisposed(this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
     currentState = _RouteLifecycle.disposed;
     route.dispose();
   }

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

@@ -618,15 +618,7 @@ class _NestedScrollCoordinator implements ScrollActivityDelegate, ScrollHoldCont
     this._onHasScrolledBodyChanged,
     this._floatHeaderSlivers,
   ) {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchCreated('widgets', '_NestedScrollCoordinator', this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: 'package:flutter/widgets.dart',
-        className: '$_NestedScrollCoordinator',
-        object: this,
-      );
-    }
     final double initialScrollOffset = _parent?.initialScrollOffset ?? 0.0;
     _outerController = _NestedScrollController(
       this,
@@ -1136,9 +1128,7 @@ class _NestedScrollCoordinator implements ScrollActivityDelegate, ScrollHoldCont
 
   @mustCallSuper
   void dispose() {
-    if (kFlutterMemoryAllocationsEnabled) {
+    assert(debugMaybeDispatchDisposed(this));
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
     _currentDrag?.dispose();
     _currentDrag = null;
     _outerController.dispose();

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

@@ -27,8 +27,6 @@ import 'framework.dart';
 import 'lookup_boundary.dart';
 import 'ticker_provider.dart';
 
-const String _flutterWidgetsLibrary = 'package:flutter/widgets.dart';
-
 // Examples can assume:
 // late BuildContext context;
 
@@ -98,9 +96,7 @@ class OverlayEntry implements Listenable {
     this.canSizeOverlay = false,
   }) : _opaque = opaque,
        _maintainState = maintainState {
-    if (kFlutterMemoryAllocationsEnabled) {
+    assert(debugMaybeDispatchCreated('widgets', 'OverlayEntry', this));
-      _maybeDispatchObjectCreation();
-    }
   }
 
   /// This entry will include the widget built by this builder in the overlay at
@@ -180,19 +176,6 @@ class OverlayEntry implements Listenable {
   ValueNotifier<_OverlayEntryWidgetState?>? _overlayEntryStateNotifier =
       ValueNotifier<_OverlayEntryWidgetState?>(null);
 
-  // TODO(polina-c): stop duplicating code across disposables
-  // https://github.com/flutter/flutter/issues/137435
-  /// Dispatches event of object creation to [FlutterMemoryAllocations.instance].
-  void _maybeDispatchObjectCreation() {
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: _flutterWidgetsLibrary,
-        className: '$OverlayEntry',
-        object: this,
-      );
-    }
-  }
-
   @override
   void addListener(VoidCallback listener) {
     assert(!_disposedByOwner);
@@ -272,9 +255,7 @@ class OverlayEntry implements Listenable {
       _overlay == null,
       'An OverlayEntry must first be removed from the Overlay before dispose is called.',
     );
-    if (kFlutterMemoryAllocationsEnabled) {
+    assert(debugMaybeDispatchDisposed(this));
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
     _disposedByOwner = true;
     if (!mounted) {
       // If we're still mounted when disposed, then this will be disposed in

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

@@ -1398,15 +1398,7 @@ class _DragInfo extends Drag {
     this.proxyDecorator,
     required this.tickerProvider,
   }) {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchCreated('widgets', '_DragInfo', this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: 'package:flutter/widgets.dart',
-        className: '$_DragInfo',
-        object: this,
-      );
-    }
     final RenderBox itemRenderBox = item.context.findRenderObject()! as RenderBox;
     listState = item._listState;
     index = item.index;
@@ -1449,9 +1441,7 @@ class _DragInfo extends Drag {
   late Offset _rawDragPosition;
 
   void dispose() {
-    if (kFlutterMemoryAllocationsEnabled) {
+    assert(debugMaybeDispatchDisposed(this));
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
     _proxyAnimation?.dispose();
   }
 

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

@@ -67,15 +67,7 @@ abstract class ScrollActivityDelegate {
 abstract class ScrollActivity {
   /// Initializes [delegate] for subclasses.
   ScrollActivity(this._delegate) {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchCreated('widgets', 'ScrollActivity', this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: 'package:flutter/widgets.dart',
-        className: '$ScrollActivity',
-        object: this,
-      );
-    }
   }
 
   /// The delegate that this activity will use to actuate the scroll view.
@@ -172,12 +164,7 @@ abstract class ScrollActivity {
   /// Called when the scroll view stops performing this activity.
   @mustCallSuper
   void dispose() {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchDisposed(this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
-
     _isDisposed = true;
   }
 
@@ -285,15 +272,7 @@ class ScrollDragController implements Drag {
        _lastNonStationaryTimestamp = details.sourceTimeStamp,
        _kind = details.kind,
        _offsetSinceLastStop = motionStartDistanceThreshold == null ? null : 0.0 {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchCreated('widgets', 'ScrollDragController', this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: 'package:flutter/widgets.dart',
-        className: '$ScrollDragController',
-        object: this,
-      );
-    }
   }
 
   /// The object that will actuate the scroll view as the user drags.
@@ -470,11 +449,7 @@ class ScrollDragController implements Drag {
   /// Called by the delegate when it is no longer sending events to this object.
   @mustCallSuper
   void dispose() {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchDisposed(this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
     _lastDetails = null;
     onDragCanceled?.call();
   }

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

@@ -348,15 +348,7 @@ class TextSelectionOverlay {
     required TextMagnifierConfiguration magnifierConfiguration,
   }) : _handlesVisible = handlesVisible,
        _value = value {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchCreated('widgets', 'TextSelectionOverlay', this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: 'package:flutter/widgets.dart',
-        className: '$TextSelectionOverlay',
-        object: this,
-      );
-    }
     renderObject.selectionStartInViewport.addListener(_updateTextSelectionOverlayVisibilities);
     renderObject.selectionEndInViewport.addListener(_updateTextSelectionOverlayVisibilities);
     _updateTextSelectionOverlayVisibilities();
@@ -607,11 +599,7 @@ class TextSelectionOverlay {
 
   /// {@macro flutter.widgets.SelectionOverlay.dispose}
   void dispose() {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchDisposed(this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
     _selectionOverlay.dispose();
     renderObject.selectionStartInViewport.removeListener(_updateTextSelectionOverlayVisibilities);
     renderObject.selectionEndInViewport.removeListener(_updateTextSelectionOverlayVisibilities);
@@ -1050,15 +1038,7 @@ class SelectionOverlay {
        _selectionEndpoints = selectionEndpoints,
        _toolbarLocation = toolbarLocation,
        assert(debugCheckHasOverlay(context)) {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchCreated('widgets', 'SelectionOverlay', this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: 'package:flutter/widgets.dart',
-        className: '$SelectionOverlay',
-        object: this,
-      );
-    }
   }
 
   /// {@macro flutter.widgets.SelectionOverlay.context}
@@ -1619,11 +1599,7 @@ class SelectionOverlay {
   /// Disposes this object and release resources.
   /// {@endtemplate}
   void dispose() {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchDisposed(this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
     hide();
     _magnifierInfo.dispose();
   }

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

@@ -357,15 +357,7 @@ class _ScreenshotContainerLayer extends OffsetLayer {
 /// a screenshot.
 class _ScreenshotData {
   _ScreenshotData({required this.target}) : containerLayer = _ScreenshotContainerLayer() {
-    // TODO(polina-c): stop duplicating code across disposables
+    assert(debugMaybeDispatchCreated('widgets', '_ScreenshotData', this));
-    // https://github.com/flutter/flutter/issues/137435
-    if (kFlutterMemoryAllocationsEnabled) {
-      FlutterMemoryAllocations.instance.dispatchObjectCreated(
-        library: 'package:flutter/widgets.dart',
-        className: '$_ScreenshotData',
-        object: this,
-      );
-    }
   }
 
   /// Target to take a screenshot of.
@@ -407,9 +399,7 @@ class _ScreenshotData {
   /// Releases allocated resources.
   @mustCallSuper
   void dispose() {
-    if (kFlutterMemoryAllocationsEnabled) {
+    assert(debugMaybeDispatchDisposed(this));
-      FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
-    }
     containerLayer.dispose();
   }
 }