Merge "Add mechanism for a task's windows to be trusted overlays" into sc-dev...

Merge "Add mechanism for a task's windows to be trusted overlays" into sc-dev am: 24706f06 am: 2446c0eb

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15150506

Change-Id: I44bbdc70ac3b455f7e018acf3596624f5c1622ef