[automerger skipped] Add mechanism for a task's windows to be trusted overlays am: 47fb132ef2 am: c9869e0d9c -s ours am: ea9b0fc9d6 -s ours

am skip reason: Merged-In I170cb5a7d22ef569eb36de21cc0bcbef60dd385e with SHA-1 47fb132ef2 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15975849

Change-Id: I3e3e46f92abc42bbd5d85e722b6ea1033438676d