This was intended to fix a reparent issue when preserving
surfaces before the app was closed. That is no longer happening
so this change is no longer needed.
The reason this causes the flicker is it waits to reparent until
next frame. However, the frame can be submitted before WM gets a
chance to show the new Surface since that request is sent to WM.
Therefore, the SurfaceView can end up getting reparented to the
new SurfaceControl before the new SurfaceControl is visible,
causing it to be hidden for a few frames.
This reverts commit c1dcac9568.
Reason for revert: b/162377855
Fixes: 162377855
Test: Split screen with SurfaceView doesn't flicker
Change-Id: Ic7a209b7aa66e278b99a526d8427f140b31de0f6
e6c662098d