libsurfaceflinger: handle WINDOW_TYPE_DONT_SCREENSHOT

When a layer has type WINDOW_TYPE_DONT_SCREENSHOT, hide it from
everywhere but the primary display.  This should be reverted when we
switch to use layer hierarchy properly.

Bug: 63311708
Test: screencap, screenrecord, android.view.cts.SurfaceViewSyncTest
Change-Id: I6a8d6b93399b0dc42832588f9a6c5e8879a8b754
5 files changed