[webview_flutter] Flaky Android failures #118199
Description
I just hit the following flake in webview_flutter_android in CI (run link):
java.lang.AssertionError: Manager has already been closed.
FATAL EXCEPTION: main
Process: io.flutter.plugins.webviewflutterandroidexample, PID: 24654
java.lang.AssertionError: Manager has already been closed.
at io.flutter.plugins.webviewflutter.InstanceManager.assertManagerIsNotClosed(InstanceManager.java:205)
at io.flutter.plugins.webviewflutter.InstanceManager.getIdentifierForStrongReference(InstanceManager.java:102)
at io.flutter.plugins.webviewflutter.WebChromeClientFlutterApiImpl.onProgressChanged(WebChromeClientFlutterApiImpl.java:35)
at io.flutter.plugins.webviewflutter.WebChromeClientHostApiImpl$WebChromeClientImpl.onProgressChanged(WebChromeClientHostApiImpl.java:46)
at Fa.d(chromium-TrichromeWebViewGoogle.apk-stable-410410683:3)
at Cs.handleMessage(chromium-TrichromeWebViewGoogle.apk-stable-410410683:57)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:223)
at android.app.ActivityThread.main(ActivityThread.java:7664)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
It failed this way on one of the two devices on the first run, and the other on the automatic internal-to-repo-tooling rerun.