The original workaround ([PR](https://github.com/flutter/engine/pull/56804)) works for the official web view plugin, but it doesn't work for a third party plugin `flutter_inappwebview` ([issue](https://github.com/pichillilorenzo/flutter_inappwebview)). Upon discussion with the author of that plugin, it turns out that their platform view is not a WKWebView, but rather a wrapper of WKWebView.
This PR performs a DFS search of the view hierarchy, and enable the workaround as long as there's a WKWebView inside.
TODO: pending sample project:
I am quite positive that it should work, but **I haven't tried it since I don't have a sample project yet**. I have requested a sample project with them so I can verify the solution.
*List which issues are fixed by this PR. You must list at least one issue.*
https://github.com/pichillilorenzo/flutter_inappwebview/issues/2415
*If you had to change anything in the [flutter/tests] repo, include a link to the migration guide as per the [breaking change policy].*
[C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style
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