Add mechanism for a task's windows to be trusted overlays (SF)
- Add a layer state to indicate that this layer and its children in the hierarchy are trusted. This can only be set by callers holding ACCESS_SURFACE_FLINGER, and will be used for the PIP task layer to indicate that activities in PIP are trusted (as they are controlled only by the user and SystemUI) Bug: 191529039 Bug: 196389741 Test: TBD Change-Id: Id92ccb087bd0d8dbaeeef3ba50b67fe015e53db8 Merged-In: Id92ccb087bd0d8dbaeeef3ba50b67fe015e53db8
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