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/AppWindowContainerController.java b/services/core/java/com/android/server/wm/AppWindowContainerController.java
index 73732dd..ae9f28b 100644
--- a/services/core/java/com/android/server/wm/AppWindowContainerController.java
+++ b/services/core/java/com/android/server/wm/AppWindowContainerController.java
@@ -690,7 +690,7 @@
                 return;
             }
             if (DEBUG_ORIENTATION) Slog.v(TAG_WM, "Clear freezing of " + mToken + ": hidden="
-                    + mContainer.isHidden() + " freezing=" + mContainer.mAppAnimator.freezingScreen);
+                    + mContainer.isHidden() + " freezing=" + mContainer.isFreezingScreen());
             mContainer.stopFreezingScreen(true, force);
         }
     }