[Android] Consider implementing backwards compatibility for sensitive content protection #159208

Flutter is currently working to support sensitive context protection on Android (see #150218) which is based on the View#setContentSensitivity API that is only supported on Android 15+. We should consider implementing some form of backwards compatibility for lower API versions by trying to detect when the screen is being shared by using the DisplayManager to detect active Displays.

Note that this would also require figuring out how to obscure sensitive content if we are able to detect screen sharing on Android APIs < 15.

See comment on technical limitations section in go/flutter-android-sensitive-content for more context.