[automerger skipped] Expose PendingIntent.addCancelListener am: 30bd1bb7 am: 81767ac8 am: 7baac81d am: 499e0307 -s ours

am skip reason: skipped by user eruffieux

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15879510

Change-Id: Ic2d99e90ffce99413f57868c826f7385bf1de47c