Traces
https://drive.google.com/file/d/1gFj_fxjHZ_rmvhC7UNGklHScb7ilTBbE/view?usp=sharing
https://drive.google.com/drive/folders/1ZQpyw8bZw1pdCiKduZRil8_Y3Bcx-myt?usp=sharing

Repro
Clone https://github.com/xster/flutter-test/tree/master/t132_performance_test_ios and https://github.com/xster/flutter-test/tree/master/t132_performance_test_flutter.

flutter build ios --debug --no-codesign or wtv in t132_performance_test_flutter
pod install in t132_performance_test_ios run in instruments.

Press 'load engine', 'show vc' and 'pop'.
PlatformView.NotifyDestroyed is called through FlutterViewController.viewDidDisappear. But looking at the VM: IOSurface allocation, they're still not freed.

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@chinmaygarde can you take a look?