Apps targeting API 28 by default do not grant permission for cleartext traffic, so update the demo app to show a warning if loading an HTTP URI will fail. See https://developer.android.com/about/versions/pie/android-9.0-changes-28 for information on behavior changes in API 28. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=208204937
