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: 95b87d42

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

Change-Id: I34c91d4dd6a874e17cfa50a51bacda94ff314ffc