Ensure public methods are running on handler thread am: ec0add72a6

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/23720720

Change-Id: Ide8c87ccbb3d27f00fecaef03bdc00c1f99b8f8a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>