[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: 0bba6771 -s ours

am skip reason: subject contains skip directive

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



Change-Id: I511bd3921942808eb5b86b47d8b4e79182b15ec5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>