[automerger skipped] Have a method to stop VPN and send event to VPN app am: efb7d713 -s ours

am skip reason: Merged-In I54b550e6f972a13f61cbcf15ee1fb9fe3c313d7b with SHA-1 395c0909 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/19881696



Change-Id: Id01fe9803dc8ff4851eb7282d4f56c7ebf9b44b8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>