Optimize updating All Apps Predictions.

* Prefetch existing predictions in onResume.
* Only update predictions if something has been changed.
* Swap predictions in place (if possible) -- this avoids
  having to relayout all of All Apps when just the predictions
  change.

Bug: 64126588
Bug: 63711551
Change-Id: Iffa0d9d7d6f99f606dd68b7df5893d6eba1574f5

src/com/android/launcher3/allapps/AllAppsContainerView.java

@@ -224,6 +224,8 @@ public class AllAppsContainerView extends BaseContainerView implements DragSourc
         mAppsRecyclerView.setLayoutManager(mLayoutManager);
         mAppsRecyclerView.setAdapter(mAdapter);
         mAppsRecyclerView.setHasFixedSize(true);
+        // Removes the animation that can occur when updating the predicted apps in place.
+        mAppsRecyclerView.getItemAnimator().setChangeDuration(0);
         if (FeatureFlags.LAUNCHER3_PHYSICS) {
             mAppsRecyclerView.setSpringAnimationHandler(mSpringAnimationHandler);
         }