Add support for secure system overlays.  (DO NOT MERGE)

This change adds a new window type for secure system overlays
created by the system itself from non-secure system overlays that
might be created by applications that have the system alert permission.
Secure views ignore the presence of secure system overlays.

Bug: 3098519
Change-Id: I8f8398f4fdeb0469e5d71124c21bedf121bd8c07
2 files changed
tree: fcddbe24fe1ee1f8918ef00dc424bdabb7e897ce
  1. cmds/
  2. include/
  3. libs/
  4. opengl/
  5. services/
  6. vpn/
  7. MODULE_LICENSE_APACHE2
  8. NOTICE