Apply fixed rotation animation for pip to fullscreen

The activity surface is rotated by WM core when changing
the windowing mode of PiP activity to fullscreen. And then
PipTaskOrganizer#onFixedRotationStarted will be called before
WindowContainerTransactionCallback#onTransactionReady. So
PipTaskOrganizer can use the given new rotation to run the
animation in current rotation. After the animation is done,
PipTaskOrganizer will set the task to fullscreen, that makes
previous top activity pause and then resume the next top
activity (the original PiP). Finally, the fixed rotation is
finished by transition done event, and then continue to
rotate the display seamlessly.

Also remove mInitialState from PipTaskOrganizer because it
is no longer needed for predicting the fullscreen bounds.

Bug: 165794724
Test: DisplayContentTests#testFixedRotationWithPip
      PipAnimationControllerTest#pipTransitionAnimator_rotatedEndValue
Test: Expand PiP in portrait which was in landscape

Change-Id: I5c1400ece9d80226bc35b497d308215010ead027