[automerger skipped] Merge "DO NOT MERGE Add logging for when IOnBackInvokedCallback is null." into tm-qpr-dev am: 31fb807e am: 05fe9355 -s ours am: 45ed3d9e -s ours am: 23710d0e -s ours

am skip reason: subject contains skip directive

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22442774



Change-Id: If6058879050c144707f2145d3123beb489074934
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>