System Bars animation for fixed rotation transform

Fade out system bars when the fixed transform is starting and fade them
in once its finished.

Bug: 150676212
Test: Manual: open and close a landscape application, and open and
      immediately cancel opening animation.
Test:  atest WmTests:com.android.server.wm.DisplayContentTests#
       testApplyTopFixedRotationTransform

Change-Id: I24d33b947193e8b87f13b497c0b32e3794f2b070