Lock free app animations (7/n): Cleanup

- Make sure persister pausing is working
- Make sure Surface animation thread is being boosted
- Move all remaining fields from AppWindowAnimator and NUKE it,
also remove getAnimLayerAdjustment and do the z-boosting
directly on the AppWindowToken.

Bug: 64674361
Test: go/wm-smoke
Test: Inspect thread priorities before/during/after animations
Change-Id: Ie64c8231bcebd8536eab476ee9f2c51abf85480c
diff --git a/services/core/java/com/android/server/wm/WallpaperWindowToken.java b/services/core/java/com/android/server/wm/WallpaperWindowToken.java
index c6b3bd3..2ae5c7b 100644
--- a/services/core/java/com/android/server/wm/WallpaperWindowToken.java
+++ b/services/core/java/com/android/server/wm/WallpaperWindowToken.java
@@ -117,7 +117,7 @@
         }
     }
 
-    void updateWallpaperWindows(boolean visible, int animLayerAdj) {
+    void updateWallpaperWindows(boolean visible) {
 
         if (isHidden() == visible) {
             if (DEBUG_WALLPAPER_LIGHT) Slog.d(TAG,