[RepaintBoundary]Cannot take Screenshot of Platform Views

## Steps to Reproduce

1. Execute `flutter run` on the code sample 
2. Press icon button to take screenshot from camera preview.

**Expected results:** Screenshot should contain camera preview picture.

**Actual results:** Screenshot doesn't include camera view.

I tested it on Samsung S9, Samsung S20 using Flutter 2.10.5 and 2.13.0-0.2.pre. 
Same issue happen on iOS, tested on iPhone 12 Pro Max, iOS 15.2.1, Flutter 2.10.5.

I'm aware of existing issues like https://github.com/flutter/flutter/issues/25306 which all point to resolved https://github.com/flutter/flutter/issues/83856#issuecomment-1072896951. 
However I can't confirm that this feature works.

<details>
<summary>Code sample</summary>

```import 'dart:async';
import 'dart:typed_data';
import 'dart:ui';

import 'package:camera/camera.dart';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  final cameras = await availableCameras();
  final firstCamera = cameras.first;

  runApp(
    MaterialApp(
      theme: ThemeData.dark(),
      home: TakePictureScreen(
        camera: firstCamera,
      ),
    ),
  );
}

//
class TakePictureScreen extends StatefulWidget {
  const TakePictureScreen({
    Key? key,
    required this.camera,
  }) : super(key: key);

  final CameraDescription camera;

  @override
  TakePictureScreenState createState() => TakePictureScreenState();
}

class TakePictureScreenState extends State<TakePictureScreen> {
  static GlobalKey boundaryKey = GlobalKey();
  late CameraController _controller;
  late Future<void> _initializeControllerFuture;

  @override
  void initState() {
    super.initState();
    _controller = CameraController(
      widget.camera,
      ResolutionPreset.veryHigh,
    );
    _initializeControllerFuture = _controller.initialize();
  }

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return RepaintBoundary(
        key: boundaryKey,
        child: Scaffold(
          appBar: AppBar(title: const Text('Take a Screenshot')),
          body: FutureBuilder<void>(
            future: _initializeControllerFuture,
            builder: (context, snapshot) {
              if (snapshot.connectionState == ConnectionState.done) {
                return CameraPreview(_controller);
              } else {
                return const Center(child: CircularProgressIndicator());
              }
            },
          ),
          floatingActionButton: FloatingActionButton(
            onPressed: () async {
              await _initializeControllerFuture;

              RenderRepaintBoundary? boundary =
                  boundaryKey.currentContext!.findRenderObject() as RenderRepaintBoundary?;
              var image = await boundary!.toImage();
              var byteData = await image.toByteData(format: ImageByteFormat.png);
              var pngBytes = byteData!.buffer.asUint8List();
              await Navigator.of(context).push(
                MaterialPageRoute(
                  builder: (context) => DisplayPictureScreen(
                    imageData: pngBytes,
                  ),
                ),
              );
            },
            child: const Icon(Icons.camera_alt),
          ),
        ));
  }
}

//
class DisplayPictureScreen extends StatelessWidget {
  final Uint8List imageData;

  const DisplayPictureScreen({Key? key, required this.imageData}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Display the Picture')),
      body: Image.memory(imageData),
    );
  }
}

```

</details>

<details>
  <summary>pubspec.yaml</summary>

```
name: screenshot_test
description: A new Flutter project.
publish_to: 'none' # Remove this line if you wish to publish to pub.dev
version: 1.0.0+1

environment:
  sdk: ">=2.12.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter

  cupertino_icons: ^1.0.2
  camera: ^0.9.4+21

dev_dependencies:
  flutter_test:
    sdk: flutter
  flutter_lints: ^2.0.0

flutter:
  uses-material-design: true
```
</details>

<details>
  <summary>flutter doctor -v</summary>

```
[√] Flutter (Channel beta, 2.13.0-0.2.pre, on Microsoft Windows [Version 10.0.19042.1288], locale ru-RU)
    • Flutter version 2.13.0-0.2.pre at e:\Programs\flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 8662e22bac (10 days ago), 2022-04-20 08:21:52 -0700
    • Engine revision 24a02fa5ee
    • Dart version 2.17.0 (build 2.17.0-266.5.beta)
    • DevTools version 2.12.2

[√] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
    • Android SDK at C:\Users\Alexey\AppData\Local\Android\sdk
    • Platform android-31, build-tools 30.0.3
    • Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
    • Java version OpenJDK Runtime Environment (build 11.0.11+9-b60-7590822)
    • All Android licenses accepted.

[√] Chrome - develop for the web
    • Chrome at C:\Program Files (x86)\Google\Chrome\Application\chrome.exe

[√] Visual Studio - develop for Windows (Visual Studio Build Tools 2019 16.5.5)
    • Visual Studio at C:\Program Files (x86)\Microsoft Visual Studio\2019\BuildTools
    • Visual Studio Build Tools 2019 version 16.5.30104.148
    • Windows 10 SDK version 10.0.18362.0

[√] Android Studio (version 2021.1)
    • Android Studio at C:\Program Files\Android\Android Studio
    • 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 11.0.11+9-b60-7590822)

[√] VS Code (version 1.64.2)
    • VS Code at C:\Users\Alexey\AppData\Local\Programs\Microsoft VS Code
    • Flutter extension can be installed from:
       https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter

[√] Connected device (3 available)
    • Windows (desktop) • windows • windows-x64    • Microsoft Windows [Version 10.0.19042.1288]
    • Chrome (web)      • chrome  • web-javascript • Google Chrome 100.0.4896.127
    • Edge (web)        • edge    • web-javascript • Microsoft Edge 87.0.664.66

[√] HTTP Host Availability
    • All required HTTP hosts are available

• No issues found!

D:\Work\Cars\Tests\Flutter\screenshot_test>flutter doctor -v
[√] Flutter (Channel beta, 2.13.0-0.2.pre, on Microsoft Windows [Version 10.0.19042.1288], locale ru-RU)
    • Flutter version 2.13.0-0.2.pre at e:\Programs\flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 8662e22bac (10 days ago), 2022-04-20 08:21:52 -0700
    • Engine revision 24a02fa5ee
    • Dart version 2.17.0 (build 2.17.0-266.5.beta)
    • DevTools version 2.12.2

[√] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
    • Android SDK at C:\Users\Alexey\AppData\Local\Android\sdk
    • Platform android-31, build-tools 30.0.3
    • Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
    • Java version OpenJDK Runtime Environment (build 11.0.11+9-b60-7590822)
    • All Android licenses accepted.

[√] Chrome - develop for the web
    • Chrome at C:\Program Files (x86)\Google\Chrome\Application\chrome.exe

[√] Visual Studio - develop for Windows (Visual Studio Build Tools 2019 16.5.5)
    • Visual Studio at C:\Program Files (x86)\Microsoft Visual Studio\2019\BuildTools
    • Visual Studio Build Tools 2019 version 16.5.30104.148
    • Windows 10 SDK version 10.0.18362.0

[√] Android Studio (version 2021.1)
    • Android Studio at C:\Program Files\Android\Android Studio
    • 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 11.0.11+9-b60-7590822)

[√] VS Code (version 1.64.2)
    • VS Code at C:\Users\Alexey\AppData\Local\Programs\Microsoft VS Code
    • Flutter extension can be installed from:
       https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter

[√] Connected device (3 available)
    • Windows (desktop) • windows • windows-x64    • Microsoft Windows [Version 10.0.19042.1288]
    • Chrome (web)      • chrome  • web-javascript • Google Chrome 100.0.4896.127
    • Edge (web)        • edge    • web-javascript • Microsoft Edge 87.0.664.66

[√] HTTP Host Availability
    • All required HTTP hosts are available

• No issues found!

```
</details>


**Screenshots**
Camera surface view:
<img src="https://user-images.githubusercontent.com/14789223/166093720-a954ba61-42ae-473c-9498-76d8e560bd67.jpg" width="200">

Screenshot result:
<img src="https://user-images.githubusercontent.com/14789223/166094170-4723488d-89c1-4d07-adbc-915d0d664af1.jpg" width="200">

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[RepaintBoundary]Cannot take Screenshot of Platform Views #102866

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[RepaintBoundary]Cannot take Screenshot of Platform Views #102866

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