Get rid of FlutterNativeView, introduce FlutterEngine and FlutterRenderer#6195

matthew-carroll merged 13 commits into

flutter-team-archive:21008_rewrite-android-embedding-to-reduce-couplingflutter-team-archive/engine:21008_rewrite-android-embedding-to-reduce-couplingfrom

matthew-carroll:break-down-flutterviewmatthew-carroll/engine:break-down-flutterviewCopy head branch name to clipboard