This works by separating an app launching to 2 phases
(similar to legacy fixed rotation). First it launches
the app into a different rotation. Once the animation
finishes it creates a new seamless display-rotation
transition.
Because we have displayRotation in windowconfiguration,
we can directly rotate a window's surface instead of
checking explicitly for fixedRotationState. Since the
second-phase is a transition, we don't (ab)use
seamlessRotator. Once the display lines-up, the
surfaces and configurations automatically update.
Since we still want to explore shell-transitions style
rotation (single-transition), add a system property
to turn it off and on.
Bug: 217560545
Test: existing tests and manual tests
Change-Id: I0b34b32ff5b2650a519d3c195df452de446cf515
91a630b912