Re-parent children when Organized Window is no longer controlled

When an Organized Window is no longer controlled by a specific client,
we create a new SurfaceControl and reparent the children so the client
no longer has control over the WindowContainer

Test: Pip, TaskOrganizerMultiWindowTest
Bug: 154558563
Change-Id: I76e0da115fd48f982a82bd6e2351e7171934acfc
8 files changed