Merge "Add null-check before reparenting content overlay" into tm-dev am:...

Merge "Add null-check before reparenting content overlay" into tm-dev am: c3b917ad am: 4e5905d4 am: 62cb0d20 am: 2e1fb50a

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18439341



Change-Id: I5caaa382a2391d1132274ebe964ecf16cfc52ae3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>