diff --git a/lib/ui/painting.dart b/lib/ui/painting.dart
index 7b44af766c4f3..3c0a7ad4ae07c 100644
--- a/lib/ui/painting.dart
+++ b/lib/ui/painting.dart
@@ -1625,6 +1625,9 @@ enum PixelFormat {
   bgra8888,
 }
 
+/// Signature for [Image] lifecycle events.
+typedef ImageEventCallback = void Function(Image image);
+
 /// Opaque handle to raw decoded image data (pixels).
 ///
 /// To obtain an [Image] object, use the [ImageDescriptor] API.
@@ -1656,12 +1659,27 @@ class Image {
       return true;
     }());
     _image._handles.add(this);
+    onCreate?.call(this);
   }
 
   // C++ unit tests access this.
   @pragma('vm:entry-point')
   final _Image _image;
 
+  /// A callback that is invoked to report an image creation.
+  ///
+  /// It's preferred to use [MemoryAllocations] in flutter/foundation.dart
+  /// than to use [onCreate] directly because [MemoryAllocations]
+  /// allows multiple callbacks.
+  static ImageEventCallback? onCreate;
+
+  /// A callback that is invoked to report the image disposal.
+  ///
+  /// It's preferred to use [MemoryAllocations] in flutter/foundation.dart
+  /// than to use [onDispose] directly because [MemoryAllocations]
+  /// allows multiple callbacks.
+  static ImageEventCallback? onDispose;
+
   StackTrace? _debugStack;
 
   /// The number of image pixels along the image's horizontal axis.
@@ -1682,6 +1700,7 @@ class Image {
   /// useful when trying to determine what parts of the program are keeping an
   /// image resident in memory.
   void dispose() {
+    onDispose?.call(this);
     assert(!_disposed && !_image._disposed);
     assert(_image._handles.contains(this));
     _disposed = true;
@@ -5745,6 +5764,9 @@ class Canvas extends NativeFieldWrapperClass1 {
   external void _drawShadow(Path path, int color, double elevation, bool transparentOccluder);
 }
 
+/// Signature for [Picture] lifecycle events.
+typedef PictureEventCallback = void Function(Picture picture);
+
 /// An object representing a sequence of recorded graphical operations.
 ///
 /// To create a [Picture], use a [PictureRecorder].
@@ -5761,6 +5783,20 @@ class Picture extends NativeFieldWrapperClass1 {
   @pragma('vm:entry-point')
   Picture._();
 
+  /// A callback that is invoked to report a picture creation.
+  ///
+  /// It's preferred to use [MemoryAllocations] in flutter/foundation.dart
+  /// than to use [onCreate] directly because [MemoryAllocations]
+  /// allows multiple callbacks.
+  static PictureEventCallback? onCreate;
+
+  /// A callback that is invoked to report the picture disposal.
+  ///
+  /// It's preferred to use [MemoryAllocations] in flutter/foundation.dart
+  /// than to use [onDispose] directly because [MemoryAllocations]
+  /// allows multiple callbacks.
+  static PictureEventCallback? onDispose;
+
   /// Creates an image from this picture.
   ///
   /// The returned image will be `width` pixels wide and `height` pixels high.
@@ -5824,6 +5860,7 @@ class Picture extends NativeFieldWrapperClass1 {
       _disposed = true;
       return true;
     }());
+    onDispose?.call(this);
     _dispose();
   }
 
@@ -5890,6 +5927,9 @@ class PictureRecorder extends NativeFieldWrapperClass1 {
     _endRecording(picture);
     _canvas!._recorder = null;
     _canvas = null;
+    // We invoke the handler here, not in the Picture constructor, because we want
+    // [picture.approximateBytesUsed] to be available for the handler.
+    Picture.onCreate?.call(picture);
     return picture;
   }
 
diff --git a/lib/web_ui/lib/canvas.dart b/lib/web_ui/lib/canvas.dart
index 4dc01537db414..afed170c199a3 100644
--- a/lib/web_ui/lib/canvas.dart
+++ b/lib/web_ui/lib/canvas.dart
@@ -125,7 +125,11 @@ abstract class Canvas {
   );
 }
 
+typedef PictureEventCallback = void Function(Picture picture);
+
 abstract class Picture {
+  static PictureEventCallback? onCreate;
+  static PictureEventCallback? onDispose;
   Future<Image> toImage(int width, int height);
   Image toImageSync(int width, int height);
   void dispose();
diff --git a/lib/web_ui/lib/painting.dart b/lib/web_ui/lib/painting.dart
index 8daf324d9d77c..3ab2ba0d3e69b 100644
--- a/lib/web_ui/lib/painting.dart
+++ b/lib/web_ui/lib/painting.dart
@@ -337,7 +337,12 @@ abstract class Gradient extends Shader {
     matrix4 != null ? engine.toMatrix32(matrix4) : null);
 }
 
+typedef ImageEventCallback = void Function(Image image);
+
 abstract class Image {
+  static ImageEventCallback? onCreate;
+  static ImageEventCallback? onDispose;
+
   int get width;
   int get height;
   Future<ByteData?> toByteData({ImageByteFormat format = ImageByteFormat.rawRgba});
diff --git a/lib/web_ui/lib/src/engine/canvaskit/image.dart b/lib/web_ui/lib/src/engine/canvaskit/image.dart
index 921d5fe024f48..8a6a8222bd054 100644
--- a/lib/web_ui/lib/src/engine/canvaskit/image.dart
+++ b/lib/web_ui/lib/src/engine/canvaskit/image.dart
@@ -149,9 +149,7 @@ Future<Uint8List> fetchImage(
 /// A [ui.Image] backed by an `SkImage` from Skia.
 class CkImage implements ui.Image, StackTraceDebugger {
   CkImage(SkImage skImage, { this.videoFrame }) {
-    if (assertionsEnabled) {
-      _debugStackTrace = StackTrace.current;
-    }
+    _init();
     if (browserSupportsFinalizationRegistry) {
       box = SkiaObjectBox<CkImage, SkImage>(this, skImage);
     } else {
@@ -200,10 +198,15 @@ class CkImage implements ui.Image, StackTraceDebugger {
   }
 
   CkImage.cloneOf(this.box) {
+    _init();
+    box.ref(this);
+  }
+
+  void _init() {
     if (assertionsEnabled) {
       _debugStackTrace = StackTrace.current;
     }
-    box.ref(this);
+    ui.Image.onCreate?.call(this);
   }
 
   @override
@@ -241,6 +244,7 @@ class CkImage implements ui.Image, StackTraceDebugger {
       !_disposed,
       'Cannot dispose an image that has already been disposed.',
     );
+    ui.Image.onDispose?.call(this);
     _disposed = true;
     box.unref(this);
   }
diff --git a/lib/web_ui/lib/src/engine/canvaskit/picture.dart b/lib/web_ui/lib/src/engine/canvaskit/picture.dart
index fa5a7c263f852..e70c28612254b 100644
--- a/lib/web_ui/lib/src/engine/canvaskit/picture.dart
+++ b/lib/web_ui/lib/src/engine/canvaskit/picture.dart
@@ -81,6 +81,7 @@ class CkPicture extends ManagedSkiaObject<SkPicture> implements ui.Picture {
       _debugDisposalStackTrace = StackTrace.current;
       return true;
     }());
+    ui.Picture.onDispose?.call(this);
     if (Instrumentation.enabled) {
       Instrumentation.instance.incrementCounter('Picture disposed');
     }
diff --git a/lib/web_ui/lib/src/engine/canvaskit/picture_recorder.dart b/lib/web_ui/lib/src/engine/canvaskit/picture_recorder.dart
index 1b63de0693384..7a0d11e433548 100644
--- a/lib/web_ui/lib/src/engine/canvaskit/picture_recorder.dart
+++ b/lib/web_ui/lib/src/engine/canvaskit/picture_recorder.dart
@@ -38,7 +38,12 @@ class CkPictureRecorder implements ui.PictureRecorder {
     final SkPicture skPicture = recorder.finishRecordingAsPicture();
     recorder.delete();
     _skRecorder = null;
-    return CkPicture(skPicture, _cullRect, _recordingCanvas!.pictureSnapshot);
+    final CkPicture result =
+      CkPicture(skPicture, _cullRect, _recordingCanvas!.pictureSnapshot);
+    // We invoke the handler here, not in the picture constructor, because we want
+    // [result.approximateBytesUsed] to be available for the handler.
+    ui.Picture.onCreate?.call(result);
+    return result;
   }
 
   @override
diff --git a/lib/web_ui/lib/src/engine/embedder.dart b/lib/web_ui/lib/src/engine/embedder.dart
index ff65ba564948f..fadec05e57a6d 100644
--- a/lib/web_ui/lib/src/engine/embedder.dart
+++ b/lib/web_ui/lib/src/engine/embedder.dart
@@ -412,9 +412,7 @@ class FlutterViewEmbedder {
   /// Called immediately after browser window language change.
   void _languageDidChange(DomEvent event) {
     EnginePlatformDispatcher.instance.updateLocales();
-    if (ui.window.onLocaleChanged != null) {
-      ui.window.onLocaleChanged!();
-    }
+    ui.window.onLocaleChanged?.call();
   }
 
   static const String orientationLockTypeAny = 'any';
diff --git a/lib/web_ui/lib/src/engine/html_image_codec.dart b/lib/web_ui/lib/src/engine/html_image_codec.dart
index 45c634f1b4a1f..11c4d29428d4d 100644
--- a/lib/web_ui/lib/src/engine/html_image_codec.dart
+++ b/lib/web_ui/lib/src/engine/html_image_codec.dart
@@ -138,7 +138,9 @@ class SingleFrameInfo implements ui.FrameInfo {
 }
 
 class HtmlImage implements ui.Image {
-  HtmlImage(this.imgElement, this.width, this.height);
+  HtmlImage(this.imgElement, this.width, this.height) {
+    ui.Image.onCreate?.call(this);
+  }
 
   final DomHTMLImageElement imgElement;
   bool _requiresClone = false;
@@ -146,6 +148,7 @@ class HtmlImage implements ui.Image {
   bool _disposed = false;
   @override
   void dispose() {
+    ui.Image.onDispose?.call(this);
     // Do nothing. The codec that owns this image should take care of
     // releasing the object url.
     if (assertionsEnabled) {
diff --git a/lib/web_ui/lib/src/engine/picture.dart b/lib/web_ui/lib/src/engine/picture.dart
index dc432b2b9f34c..074dc9f27856d 100644
--- a/lib/web_ui/lib/src/engine/picture.dart
+++ b/lib/web_ui/lib/src/engine/picture.dart
@@ -40,7 +40,11 @@ class EnginePictureRecorder implements ui.PictureRecorder {
     }
     _isRecording = false;
     _canvas!.endRecording();
-    return EnginePicture(_canvas, cullRect);
+    final EnginePicture result = EnginePicture(_canvas, cullRect);
+    // We invoke the handler here, not in the Picture constructor, because we want
+    // [result.approximateBytesUsed] to be available for the handler.
+    ui.Picture.onCreate?.call(result);
+    return result;
   }
 }
 
@@ -97,6 +101,7 @@ class EnginePicture implements ui.Picture {
 
   @override
   void dispose() {
+    ui.Picture.onDispose?.call(this);
     _disposed = true;
   }
 
diff --git a/lib/web_ui/test/canvaskit/image_test.dart b/lib/web_ui/test/canvaskit/image_test.dart
index f6ba8031cf1a4..9f4d620c9fa58 100644
--- a/lib/web_ui/test/canvaskit/image_test.dart
+++ b/lib/web_ui/test/canvaskit/image_test.dart
@@ -24,6 +24,50 @@ void testMain() {
     image.dispose();
   // TODO(hterkelsen): https://github.com/flutter/flutter/issues/109265
   }, skip: isFirefox);
+
+  test('Image constructor invokes onCreate once', () async {
+    int onCreateInvokedCount = 0;
+    ui.Image? createdImage;
+    ui.Image.onCreate = (ui.Image image) {
+      onCreateInvokedCount++;
+      createdImage = image;
+    };
+
+    final ui.Image  image1 = await _createImage();
+
+    expect(onCreateInvokedCount, 1);
+    expect(createdImage, image1);
+
+    final ui.Image image2 = await _createImage();
+
+    expect(onCreateInvokedCount, 2);
+    expect(createdImage, image2);
+
+    ui.Image.onCreate = null;
+  // TODO(hterkelsen): https://github.com/flutter/flutter/issues/109265
+  }, skip: isFirefox);
+
+  test('dispose() invokes onDispose once', () async {
+    int onDisposeInvokedCount = 0;
+    ui.Image? disposedImage;
+    ui.Image.onDispose = (ui.Image image) {
+      onDisposeInvokedCount++;
+      disposedImage = image;
+    };
+
+    final ui.Image image1 = await _createImage()..dispose();
+
+    expect(onDisposeInvokedCount, 1);
+    expect(disposedImage, image1);
+
+    final ui.Image image2 = await _createImage()..dispose();
+
+    expect(onDisposeInvokedCount, 2);
+    expect(disposedImage, image2);
+
+    ui.Image.onDispose = null;
+  // TODO(hterkelsen): https://github.com/flutter/flutter/issues/109265
+  }, skip: isFirefox);
 }
 
 Future<ui.Image> _createImage() => _createPicture().toImage(10, 10);
diff --git a/lib/web_ui/test/engine/image/image_test.dart b/lib/web_ui/test/engine/image/image_test.dart
index 8d690483a7ea6..c0b6235368b3f 100644
--- a/lib/web_ui/test/engine/image/image_test.dart
+++ b/lib/web_ui/test/engine/image/image_test.dart
@@ -17,7 +17,53 @@ Future<void> testMain() async {
     expect(image.runtimeType.toString(), equals('HtmlImage'));
     image.dispose();
   // TODO(polina-c): unskip the test when bug is fixed:
-  // https://github.com/flutter/engine/pull/35791
+  // https://github.com/flutter/flutter/issues/110599
+  }, skip: true);
+
+  test('Image constructor invokes onCreate once', () async {
+    int onCreateInvokedCount = 0;
+    ui.Image? createdImage;
+    ui.Image.onCreate = (ui.Image image) {
+      onCreateInvokedCount++;
+      createdImage = image;
+    };
+
+    final ui.Image image1 = await _createImage();
+
+    expect(onCreateInvokedCount, 1);
+    expect(createdImage, image1);
+
+    final ui.Image image2 = await _createImage();
+
+    expect(onCreateInvokedCount, 2);
+    expect(createdImage, image2);
+
+    ui.Image.onCreate = null;
+  // TODO(polina-c): unskip the test when bug is fixed:
+  // https://github.com/flutter/flutter/issues/110599
+  }, skip: true);
+
+  test('dispose() invokes onDispose once', () async {
+    int onDisposeInvokedCount = 0;
+    ui.Image? disposedImage;
+    ui.Image.onDispose = (ui.Image image) {
+      onDisposeInvokedCount++;
+      disposedImage = image;
+    };
+
+    final ui.Image image1 = await _createImage()..dispose();
+
+    expect(onDisposeInvokedCount, 1);
+    expect(disposedImage, image1);
+
+    final ui.Image image2 = await _createImage()..dispose();
+
+    expect(onDisposeInvokedCount, 2);
+    expect(disposedImage, image2);
+
+    ui.Image.onDispose = null;
+  // TODO(polina-c): unskip the test when bug is fixed:
+  // https://github.com/flutter/flutter/issues/110599
   }, skip: true);
 }
 
diff --git a/lib/web_ui/test/engine/picture_test.dart b/lib/web_ui/test/engine/picture_test.dart
new file mode 100644
index 0000000000000..d4c5928d38fdb
--- /dev/null
+++ b/lib/web_ui/test/engine/picture_test.dart
@@ -0,0 +1,74 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:test/bootstrap/browser.dart';
+import 'package:test/test.dart';
+import 'package:ui/ui.dart' as ui;
+
+void main() {
+  internalBootstrapBrowserTest(() => testMain);
+}
+
+Future<void> testMain() async {
+  test('Picture construction invokes onCreate once', () async {
+    int onCreateInvokedCount = 0;
+    ui.Picture? createdPicture;
+    ui.Picture.onCreate = (ui.Picture picture) {
+      onCreateInvokedCount++;
+      createdPicture = picture;
+    };
+
+    final ui.Picture picture1 = _createPicture();
+
+    expect(onCreateInvokedCount, 1);
+    expect(createdPicture, picture1);
+
+    final ui.Picture picture2 = _createPicture();
+
+    expect(onCreateInvokedCount, 2);
+    expect(createdPicture, picture2);
+    ui.Picture.onCreate = null;
+  });
+
+  test('approximateBytesUsed is available for onCreate', () async {
+    int pictureSize = -1;
+
+    ui.Picture.onCreate = (ui.Picture picture) =>
+      pictureSize = picture.approximateBytesUsed;
+
+    _createPicture();
+
+    expect(pictureSize >= 0, true);
+    ui.Picture.onCreate = null;
+  });
+
+  test('dispose() invokes onDispose once', () async {
+    int onDisposeInvokedCount = 0;
+    ui.Picture? disposedPicture;
+    ui.Picture.onDispose = (ui.Picture picture) {
+      onDisposeInvokedCount++;
+      disposedPicture = picture;
+    };
+
+    final ui.Picture picture1 = _createPicture()..dispose();
+
+    expect(onDisposeInvokedCount, 1);
+    expect(disposedPicture, picture1);
+
+    final ui.Picture picture2 = _createPicture()..dispose();
+
+    expect(onDisposeInvokedCount, 2);
+    expect(disposedPicture, picture2);
+
+    ui.Picture.onDispose = null;
+  });
+}
+
+ui.Picture _createPicture() {
+  final ui.PictureRecorder recorder = ui.PictureRecorder();
+  final ui.Canvas canvas = ui.Canvas(recorder);
+  const ui.Rect rect = ui.Rect.fromLTWH(0.0, 0.0, 100.0, 100.0);
+  canvas.clipRect(rect);
+  return recorder.endRecording();
+}
diff --git a/testing/dart/BUILD.gn b/testing/dart/BUILD.gn
index 712bae0f1d56d..04035d13d8f2e 100644
--- a/testing/dart/BUILD.gn
+++ b/testing/dart/BUILD.gn
@@ -22,6 +22,7 @@ tests = [
   "http_disallow_http_connections_test.dart",
   "image_descriptor_test.dart",
   "image_dispose_test.dart",
+  "image_events_test.dart",
   "image_filter_test.dart",
   "image_resize_test.dart",
   "image_shader_test.dart",
@@ -34,6 +35,7 @@ tests = [
   "paragraph_builder_test.dart",
   "paragraph_test.dart",
   "path_test.dart",
+  "picture_test.dart",
   "platform_view_test.dart",
   "plugin_utilities_test.dart",
   "semantics_test.dart",
diff --git a/testing/dart/image_dispose_test.dart b/testing/dart/image_dispose_test.dart
index fe0d11fda832a..e96ca0dcb44a8 100644
--- a/testing/dart/image_dispose_test.dart
+++ b/testing/dart/image_dispose_test.dart
@@ -17,7 +17,7 @@ void main() {
   }());
 
   test('Handles are distinct', () async {
-    final Uint8List bytes = await readFile('2x2.png');
+    final Uint8List bytes = await _readFile('2x2.png');
     final Codec codec = await instantiateImageCodec(bytes);
     final FrameInfo frame = await codec.getNextFrame();
 
@@ -36,7 +36,7 @@ void main() {
   });
 
   test('Canvas can paint image from handle and byte data from handle', () async {
-    final Uint8List bytes = await readFile('2x2.png');
+    final Uint8List bytes = await _readFile('2x2.png');
     final Codec codec = await instantiateImageCodec(bytes);
     final FrameInfo frame = await codec.getNextFrame();
 
@@ -66,7 +66,7 @@ void main() {
   });
 
   test('Records stack traces', () async {
-    final Uint8List bytes = await readFile('2x2.png');
+    final Uint8List bytes = await _readFile('2x2.png');
     final Codec codec = await instantiateImageCodec(bytes);
     final FrameInfo frame = await codec.getNextFrame();
 
@@ -92,7 +92,7 @@ void main() {
   }, skip: !assertsEnabled);
 
   test('Clones can be compared', () async {
-    final Uint8List bytes = await readFile('2x2.png');
+    final Uint8List bytes = await _readFile('2x2.png');
     final Codec codec = await instantiateImageCodec(bytes);
     final FrameInfo frame = await codec.getNextFrame();
 
@@ -115,7 +115,7 @@ void main() {
   });
 
   test('debugDisposed works', () async {
-    final Uint8List bytes = await readFile('2x2.png');
+    final Uint8List bytes = await _readFile('2x2.png');
     final Codec codec = await instantiateImageCodec(bytes);
     final FrameInfo frame = await codec.getNextFrame();
 
@@ -134,7 +134,7 @@ void main() {
   });
 }
 
-Future<Uint8List> readFile(String fileName) async {
+Future<Uint8List> _readFile(String fileName) async {
   final File file = File(path.join(
     'flutter',
     'testing',
diff --git a/testing/dart/image_events_test.dart b/testing/dart/image_events_test.dart
new file mode 100644
index 0000000000000..92b856c0014e4
--- /dev/null
+++ b/testing/dart/image_events_test.dart
@@ -0,0 +1,56 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:async';
+import 'dart:ui';
+
+import 'package:litetest/litetest.dart';
+
+void main() {
+  test('Image constructor and dispose invokes onCreate once', () async {
+    // We test constructor and dispose in one test because
+    // litetest runs the tests in parallel and static handlers
+    // are shared between tests.
+
+    int onCreateInvokedCount = 0;
+    Image? createdImage;
+    int onDisposeInvokedCount = 0;
+    Image? disposedImage;
+    Image.onCreate = (Image image) {
+      onCreateInvokedCount++;
+      createdImage = image;
+    };
+    Image.onDispose = (Image image) {
+      onDisposeInvokedCount++;
+      disposedImage = image;
+    };
+
+    final Image image1 = await _createImage()..dispose();
+
+    expect(onCreateInvokedCount, 1);
+    expect(createdImage, image1);
+    expect(onDisposeInvokedCount, 1);
+    expect(disposedImage, image1);
+
+    final Image image2 = await _createImage()..dispose();
+
+    expect(onCreateInvokedCount, 2);
+    expect(createdImage, image2);
+    expect(onDisposeInvokedCount, 2);
+    expect(disposedImage, image2);
+
+    Image.onCreate = null;
+    Image.onDispose = null;
+  });
+}
+
+Future<Image> _createImage() => _createPicture().toImage(10, 10);
+
+Picture _createPicture() {
+  final PictureRecorder recorder = PictureRecorder();
+  final Canvas canvas = Canvas(recorder);
+  const Rect rect = Rect.fromLTWH(0.0, 0.0, 100.0, 100.0);
+  canvas.clipRect(rect);
+  return recorder.endRecording();
+}
diff --git a/testing/dart/picture_test.dart b/testing/dart/picture_test.dart
new file mode 100644
index 0000000000000..4ea13962fcaa8
--- /dev/null
+++ b/testing/dart/picture_test.dart
@@ -0,0 +1,70 @@
+// Copyright 2022 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:ui';
+
+import 'package:litetest/litetest.dart';
+
+void main() {
+  test('Picture construction invokes onCreate once', () async {
+    int onCreateInvokedCount = 0;
+    Picture? createdPicture;
+    Picture.onCreate = (Picture picture) {
+      onCreateInvokedCount++;
+      createdPicture = picture;
+    };
+
+    final Picture picture1 = _createPicture();
+
+    expect(onCreateInvokedCount, 1);
+    expect(createdPicture, picture1);
+
+    final Picture picture2 = _createPicture();
+
+    expect(onCreateInvokedCount, 2);
+    expect(createdPicture, picture2);
+    Picture.onCreate = null;
+  });
+
+  test('approximateBytesUsed is available for onCreate', () async {
+    int pictureSize = -1;
+
+    Picture.onCreate = (Picture picture) =>
+      pictureSize = picture.approximateBytesUsed;
+
+    _createPicture();
+
+    expect(pictureSize >= 0, true);
+    Picture.onCreate = null;
+  });
+
+  test('dispose() invokes onDispose once', () async {
+    int onDisposeInvokedCount = 0;
+    Picture? disposedPicture;
+    Picture.onDispose = (Picture picture) {
+      onDisposeInvokedCount++;
+      disposedPicture = picture;
+    };
+
+    final Picture picture1 = _createPicture()..dispose();
+
+    expect(onDisposeInvokedCount, 1);
+    expect(disposedPicture, picture1);
+
+    final Picture picture2 = _createPicture()..dispose();
+
+    expect(onDisposeInvokedCount, 2);
+    expect(disposedPicture, picture2);
+
+    Picture.onDispose = null;
+  });
+}
+
+Picture _createPicture() {
+  final PictureRecorder recorder = PictureRecorder();
+  final Canvas canvas = Canvas(recorder);
+  const Rect rect = Rect.fromLTWH(0.0, 0.0, 100.0, 100.0);
+  canvas.clipRect(rect);
+  return recorder.endRecording();
+}
diff --git a/web_sdk/test/api_conform_test.dart b/web_sdk/test/api_conform_test.dart
index 755b6f9a3345c..db5ffb8587ed7 100644
--- a/web_sdk/test/api_conform_test.dart
+++ b/web_sdk/test/api_conform_test.dart
@@ -247,8 +247,15 @@ void main() {
       final SimpleFormalParameter webParam =
           (webTypeDef.type as GenericFunctionType).parameters.parameters[i]
               as SimpleFormalParameter;
-
-      if (webParam.identifier!.name != uiParam.identifier!.name) {
+      if (webParam.identifier == null) {
+        failed = true;
+        print('Warning: lib/web_ui/ui.dart $typeDefName parameter $i should have name.');
+      }
+      if (uiParam.identifier == null) {
+        failed = true;
+        print('Warning: lib/ui/ui.dart $typeDefName parameter $i should have name.');
+      }
+      if (webParam.identifier?.name != uiParam.identifier?.name) {
         failed = true;
         print('Warning: lib/ui/ui.dart $typeDefName parameter $i '
             '${uiParam.identifier!.name} has a different name in lib/web_ui/ui.dart.');