This was introduced when I did the fading of the lock screen,
which relies on setting the policy visibility of the windows behind
it to be hidden. As a result, when the orientation changed or
the activity was restarted, they wouldn't be resized or reported
as drawn, and the activity manager would wait until its timeout
before unfreezing the screen.
We now have a new method on WindowState to find out if a window
has drawn itself, which is used in the appropriate places.
Change-Id: If05f8b1947d3029917f62ad0f89b43544bd0a4dc
7433e8aebd