Merge "Listen to live cancellation signal" into udc-dev am: 2b1526b1

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22103154



Change-Id: I409c21df93d331e0664bbec714d29121971a7f39
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>