Engine autoroller blocked with Android embedder NPE with plugin

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Failure:

1862 2020-12-01T14:34:34.493011: stderr: [   +2 ms] VMServiceFlutterDriver: >>> {command: tap, finderType: ByValueKey, keyValueString: step, keyValueType: String}
1863 2020-12-01T14:34:34.962001: stdout: [ +468 ms] E/MethodChannel#flutter/platform( 9732): Failed to handle method call
1864 2020-12-01T14:34:34.962222: stdout: [        ] E/MethodChannel#flutter/platform( 9732): java.lang.NullPointerException: Attempt to invoke interface method 'boolean io.flutter.plugin.platform.PlatformPlugi     n$PlatformPluginDelegate.popSystemNavigator()' on a null object reference

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Above crash fixed in flutter/engine#22852

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Roller is now re-enabled.

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