Repository: flutter
Issue: [Flutter Web on IOS device] bug with BorderRadius using image
Labels: platform-ios,framework,platform-web,e: web_html,has reproducible steps,P2,found in release: 2.8,found in release: 2.9,team-framework,triaged-framework

<!-- Thank you for using Flutter!

     If you are looking for support, please check out our documentation
     or consider asking a question on Stack Overflow:
      * https://flutter.dev/
      * https://api.flutter.dev/
      * https://stackoverflow.com/questions/tagged/flutter?sort=frequent

     If you have found a bug or if our documentation doesn't have an answer
     to what you're looking for, then fill out the template below. Please read
     our guide to filing a bug first: https://flutter.dev/docs/resources/bug-reports
-->

## Steps to Reproduce

<!-- Please include full steps to reproduce so that we can reproduce the problem. -->

1. Using flutterWeb build.
2. run it , and **use IOS browser** ( safari or Chrome : same result)
3. Bug if using DecorationImage with BorderRadius 
4. Test with IOS simulator or real device : same bug



**Actual results:** <!-- what did you see? -->

![image](https://user-images.githubusercontent.com/97786903/149648686-025cdcb1-34c2-4a0d-b84f-e7fe7bddc81d.png)


<details>
<summary>
Code
</summary>

<!--
      Please create a minimal reproducible sample that shows the problem
      and attach it below between the lines with the backticks.

      To create it you can use `flutter create bug` command and update the `main.dart` file.

      Alternatively, you can use https://dartpad.dev/
      which is capable of creating and running small Flutter apps.

      Without this we will unlikely be able to progress on the issue, and because of that
      we regretfully will have to close it.
-->

```
import 'package:flutter/material.dart';

class CgvScreen extends StatelessWidget {
  const CgvScreen({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(),
        body: Container(
          height: 250,
          decoration: BoxDecoration(
              borderRadius: BorderRadius.circular(30),
              //color: Colors.green,
              image: DecorationImage(
                  image: AssetImage('images/flutter_img.png'),
                  fit: BoxFit.cover),
              boxShadow: [
                BoxShadow(
                    color: Colors.grey, blurRadius: 10, offset: Offset(0, 10))
              ]),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: [Container()],
          ),
        ));
  }
}
```

</details>

<details>
  <summary>Logs</summary>

<!--
      Run your application with `flutter run --verbose` and attach all the
      log output below between the lines with the backticks. If there is an
      exception, please see if the error message includes enough information
      to explain how to solve the issue.
-->

```
[✓] Flutter (Channel stable, 2.8.1, on macOS 11.6.1 20G224 darwin-arm, locale fr-NC)
    • Flutter version 2.8.1 at /Users/philippededieu/Documents/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 77d935af4d (4 weeks ago), 2021-12-16 08:37:33 -0800
    • Engine revision 890a5fca2e
    • Dart version 2.15.1

[!] Android toolchain - develop for Android devices (Android SDK version 31.0.0)
    • Android SDK at /Users/philippededieu/Library/Android/sdk
    ✗ cmdline-tools component is missing
      Run `path/to/sdkmanager --install "cmdline-tools;latest"`
      See https://developer.android.com/studio/command-line for more details.
    ✗ Android license status unknown.
      Run `flutter doctor --android-licenses` to accept the SDK licenses.
      See https://flutter.dev/docs/get-started/install/macos#android-setup for more details.

[✓] Xcode - develop for iOS and macOS (Xcode 13.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • CocoaPods version 1.11.2

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2020.3)
    • 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 11.0.10+0-b96-7249189)

[!] Android Studio
    • Android Studio at /Users/philippededieu/Downloads/Android Studio Preview.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
    ✗ Unable to find bundled Java version.
    • Try updating or re-installing Android Studio.

[✓] VS Code (version 1.63.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.32.0

[✓] Connected device (3 available)
    • iPhone de Serena (mobile) • 1501fe595ca90cd14552c1ef9b781ec5acda6855 • ios            • iOS 15.1 19B74
    • iPhone 12 (mobile)        • A407296A-E987-4B80-9BF1-483D2145B719     • ios            • com.apple.CoreSimulator.SimRuntime.iOS-15-0 (simulator)
    • Chrome (web)              • chrome                                   • web-javascript • Google Chrome 97.0.4692.71

```

<!--
     Run `flutter analyze` and attach any output of that command below.
     If there are any analysis errors, try resolving them before filing this issue.
-->

```
```

<!-- Finally, paste the output of running `flutter doctor -v` here. -->

```
```

</details>


<!--
      Consider also attaching screenshots and/or videos to better
      illustrate the issue.

      You can upload them directly on GitHub.
      Beware that video file size is limited to 10MB.
-->