Fix issue #3302006: Cannot see the dialog lunched from a transparent activity.

The activity manager was not performing the layout pass on the new window,
because its app token was still hidden, because the activity manager / window
manager were still waiting for it to be ready to show.

Just ignore whether the app token is hidden for this case.

Also fixes some problems with animations, and tweaks the ViewConfiguration
values for xlarge screens.

Change-Id: Icbe9c77ba8127d1e02df2d6f27b8e86ec842e50a