Unimplemented Error ShaderMask on Web

[Xrok]

Steps to Reproduce

This error occurs on the web platform, on iOS the expected result is achieved.

1. Run flutter run -d chrome.
2. Update the files as follows:

main.dart

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  const MyHomePage({Key key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: ShaderMask(
          blendMode: BlendMode.srcATop,
          shaderCallback: (Rect bounds) {
            return RadialGradient(
              center: Alignment.topLeft,
              radius: 1.0,
              colors: <Color>[Colors.yellow, Colors.deepOrange.shade900],
              tileMode: TileMode.mirror,
            ).createShader(bounds);
          },
          child: const Text('I’m burning the memories'),
        ),
      ),
    );
  }
}

Expected results:

Actual results:
BlankPage and UnimplementedError

Logs

[+13419 ms] Waiting for connection from debug service on Chrome... (completed in 17.3s)
[        ] Synced 29.1MB.
[        ] <- accept
[        ] Caching compiled dill
[ +148 ms] Using Google Chrome 89.0.4389.128 

[+1073 ms] [CHROME]:2021-04-17 11:27:08.014 Google Chrome[82109:1434774] Error loading /Library/CoreMediaIO/Plug-Ins/DAL/GoProWebCam.plugin/Contents/MacOS/GoProWebCam:
dlopen(/Library/CoreMediaIO/Plug-Ins/DAL/GoProWebCam.plugin/Contents/MacOS/GoProWebCam, 262): no suitable image found.  Did find:
[   +1 ms] [CHROME]:    /Library/CoreMediaIO/Plug-Ins/DAL/GoProWebCam.plugin/Contents/MacOS/GoProWebCam: code signature in (/Library/CoreMediaIO/Plug-Ins/DAL/GoProWebCam.plugin/Contents/MacOS/GoProWebCam)
not valid for use in process using Library Validation: mapping process and mapped file (non-platform) have different Team IDs
[        ] [CHROME]:    /Library/CoreMediaIO/Plug-Ins/DAL/GoProWebCam.plugin/Contents/MacOS/GoProWebCam: stat() failed with errno=9
[ +185 ms] [CHROME]:
[        ] [CHROME]:DevTools listening on ws://127.0.0.1:60068/devtools/browser/0d2e4c8d-d662-49e5-93c2-e8abd1de6731
[ +859 ms] DwdsInjector: Received request for entrypoint at http://localhost:60046/main_module.bootstrap.js
[   +7 ms] MetadataProvider: Loading debug metadata...
[  +13 ms] MetadataProvider: Loaded debug metadata
[   +7 ms] DwdsInjector: Injected debugging metadata for entrypoint at http://localhost:60046/main_module.bootstrap.js
[+1994 ms] DevHandler: Debug service listening on ws://127.0.0.1:60091/NJag_hJ7ibE=/ws

[  +15 ms] Debug service listening on ws://127.0.0.1:60091/NJag_hJ7ibE=/ws
[        ] Running with unsound null safety
[        ] For more information see https://dart.dev/null-safety/unsound-null-safety
[   +2 ms] 🔥  To hot restart changes while running, press "r" or "R".
[   +1 ms] For a more detailed help message, press "h". To quit, press "q".
[+2320 ms] ══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
[        ] The following UnimplementedError was thrown during a scheduler callback:
[        ] UnimplementedError
[   +3 ms] When the exception was thrown, this was the stack:
[        ] dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 236:49  throw_
[        ] lib/_engine/engine/canvaskit/layer_scene_builder.dart 196:5                   pushShaderMask
[        ] packages/flutter/src/rendering/layer.dart 1779:26                             addToScene
[        ] packages/flutter/src/rendering/layer.dart 407:5                               [_addToSceneWithRetainedRendering]
[        ] packages/flutter/src/rendering/layer.dart 994:14                              addChildrenToScene
[        ] packages/flutter/src/rendering/layer.dart 1966:5                              addToScene
[        ] packages/flutter/src/rendering/layer.dart 407:5                               [_addToSceneWithRetainedRendering]
[        ] packages/flutter/src/rendering/layer.dart 994:14                              addChildrenToScene
[        ] packages/flutter/src/rendering/layer.dart 1131:5                              addToScene
[        ] packages/flutter/src/rendering/layer.dart 407:5                               [_addToSceneWithRetainedRendering]
[        ] packages/flutter/src/rendering/layer.dart 994:14                              addChildrenToScene
[        ] packages/flutter/src/rendering/layer.dart 1131:5                              addToScene
[   +1 ms] packages/flutter/src/rendering/layer.dart 407:5                               [_addToSceneWithRetainedRendering]
[        ] packages/flutter/src/rendering/layer.dart 994:14                              addChildrenToScene
[        ] packages/flutter/src/rendering/layer.dart 1576:5                              addToScene
[        ] packages/flutter/src/rendering/layer.dart 732:5                               buildScene
[        ] packages/flutter/src/rendering/view.dart 217:30                               compositeFrame
[        ] packages/flutter/src/rendering/binding.dart 457:18                            drawFrame
[        ] packages/flutter/src/widgets/binding.dart 874:13                              drawFrame
[        ] packages/flutter/src/rendering/binding.dart 319:5                             [_handlePersistentFrameCallback]
[        ] packages/flutter/src/scheduler/binding.dart 1144:15                           [_invokeFrameCallback]
[        ] packages/flutter/src/scheduler/binding.dart 1082:9                            handleDrawFrame
[        ] packages/flutter/src/scheduler/binding.dart 865:7                             <fn>
[        ] dart-sdk/lib/_internal/js_dev_runtime/private/isolate_helper.dart 48:19       internalCallback
[        ] ════════════════════════════════════════════════════════════════════════════════════════════════════
[        ] Another exception was thrown: UnimplementedError

[✓] Flutter (Channel stable, 2.0.5, on macOS 11.2.3 20D91 darwin-x64, locale en)
    • Flutter version 2.0.5 at /Users/xrok/Develop/flutter
    • Framework revision adc687823a (24 hours ago), 2021-04-16 09:40:20 -0700
    • Engine revision b09f014e96
    • Dart version 2.12.3

[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.2)
    • Android SDK at /Users/xrok/Library/Android/sdk
    • Platform android-30, build-tools 30.0.2
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6915495)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 12.4, Build version 12D4e
    • CocoaPods version 1.10.1

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 4.1)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6915495)

[✓] VS Code (version 1.55.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.21.0

[✓] Connected device (2 available)
    • Chrome (web)             • chrome                                   • web-javascript • Google Chrome 89.0.4389.128

• No issues found!

[darshankawar]

Verified this on latest stable version (2.2.1) and can see the expected behavior:

flutter doctor -v

[✓] Flutter (Channel stable, 2.2.1, on Mac OS X 10.15.4 19E2269 darwin-x64,
    locale en-GB)
    • Flutter version 2.2.1 at /Users/dhs/documents/fluttersdk/flutter
    • Framework revision 02c026b03c (4 days ago), 2021-05-27 12:24:44 -0700
    • Engine revision 0fdb562ac8
    • Dart version 2.13.1

[✓] Xcode - develop for iOS and macOS
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 12.3, Build version 12C33
    • CocoaPods version 1.10.1

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] VS Code (version 1.55.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.21.0

[✓] Connected device (4 available)
    • Darshan's iphone (mobile)  • 21150b119064aecc249dfcfe05e259197461ce23 •
      ios            • iOS 14.4.1
    • iPhone 12 Pro Max (mobile) • A5473606-0213-4FD8-BA16-553433949729     •
      ios            • com.apple.CoreSimulator.SimRuntime.iOS-14-3 (simulator)
    • macOS (desktop)            • macos                                    •
      darwin-x64     • Mac OS X 10.15.4 19E2269 darwin-x64
    • Chrome (web)               • chrome                                   •
      web-javascript • Google Chrome 91.0.4472.77

• No issues found!

Closing this as not reproducible and must have been fixed for web, per this comment.

[github-actions]

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