Migrate to new androidx target for support library.
am: 39387e0806

Change-Id: I8d7707327ea27e7b8d30671bd92bdeaded282550
tree: cbfc6c133e00bdc055cfa0a710842b79e7e8f965
  1. res/
  2. src/
  3. Android.mk
  4. AndroidManifest.xml
  5. proguard.flags