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Hide all insets when the dream is activated
By default we hide all insets while the DreamActivity is active. The client app has access to the main window of the activity, so it could override this. Bug: 151749301 Test: m && flash && start the screensaver and verify that nav bar is gone Change-Id: Iecdc5f67c976de5477523e9745a9e8733703c11f