Merge "Ensure public methods are running on handler thread" am: 7e343d58ce am: 87d5d84cf0 am: 1ff3ffdf62

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2584553

Change-Id: I196e7940e944b94c267bb0964a2639d8a32d3c3b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>