iframe consumes pointer events from widgets appearing on top

## Steps to Reproduce

```dart
// ignore: avoid_web_libraries_in_flutter
import 'dart:html';
import 'dart:ui' as ui;

import 'package:flutter/material.dart';

void main() {
  // ignore:undefined_prefixed_name
  ui.platformViewRegistry.registerViewFactory('someViewType', (int viewId) {
    final wrapper = DivElement();
    final div = IFrameElement()
        ..width = '640'
        ..height = '360'
        ..src = 'https://www.youtube.com/embed/IyFZznAk69U'
        ..style.border = 'none';
    wrapper.append(div);
    return wrapper;
  });
 
  runApp(MaterialApp(home: HomeScreen()));
}

class HomeScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      drawer: Drawer(child: Container(color:Colors.yellow, child: RaisedButton(
      onPressed:()=>debugPrint("123123")
      ))),
      body:  SizedBox(
      width: 640,
      height: 360,
      child: HtmlWidget(),
    ),
      floatingActionButton: Builder(builder: (context) {
        return FloatingActionButton(
          child: Icon(Icons.menu, color: Colors.white),
          onPressed: () {
            Scaffold.of(context).openDrawer();
          },
        );
      }),
    );
  }
}

class HtmlWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return HtmlElementView(viewType: 'someViewType');
  }
}

class HtmlHelloWorldWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return HtmlElementView(viewType: 'hello-world-html');
  }
}
```

**Actual results:** 
![image](https://user-images.githubusercontent.com/4378435/78465789-8d3be300-772c-11ea-8ae2-7ad7846786d2.png)


<details>
  <summary>flutter doctor -v</summary>


```
[✓] Flutter (Channel dev, v1.16.4-pre.50, on Mac OS X 10.15.4 19E266, locale
    zh-Hans-US)
    • Flutter version 1.16.4-pre.50 at /Users/angus/flutter
    • Framework revision d14a301e41 (4 days ago), 2020-03-31 19:14:22 -0400
    • Engine revision fc5b44c901
    • Dart version 2.8.0 (build 2.8.0-dev.18.0 e8c4aed700)

 
[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
    • Android SDK at /Users/angus/Library/Android/sdk
    • Platform android-29, build-tools 29.0.2
    • Java binary at: /Applications/Android
      Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build
      1.8.0_212-release-1586-b4-5784211)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 11.4)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 11.4, Build version 11E146
    • CocoaPods version 1.9.0.beta.2

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 3.6)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin version 44.0.2
    • Dart plugin version 192.7761
    • Java version OpenJDK Runtime Environment (build
      1.8.0_212-release-1586-b4-5784211)

[✓] IntelliJ IDEA Ultimate Edition (version 2019.3.2)
    • IntelliJ at /Applications/IntelliJ IDEA.app
    • Flutter plugin version 43.0.3
    • Dart plugin version 193.6015.53

[✓] VS Code (version 1.43.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.9.0

[✓] Connected device (3 available)
    • macOS      • macOS      • darwin-x64     • Mac OS X 10.15.4 19E266
    • Chrome     • chrome     • web-javascript • Google Chrome 80.0.3987.149
    • Web Server • web-server • web-javascript • Flutter Tools

• No issues found!
```

</details>


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iframe consumes pointer events from widgets appearing on top #54027

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iframe consumes pointer events from widgets appearing on top #54027

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