通过一下文件对比判断哪个版本添加的

已添加：

https://github.com/flutter/flutter/blob/3.16.0/packages/flutter/lib/src/widgets/platform_view.dart

https://github.com/flutter/flutter/blob/3.15.0-0.0.pre/packages/flutter/lib/src/widgets/platform_view.dart

未添加：

https://github.com/flutter/flutter/blob/3.14.0-14.0.pre/packages/flutter/lib/src/widgets/platform_view.dart