Introduce onAnimateToSearchStateCompleted() in SearchUiDelegate.

This will be called when transition animation to search is completed.

Bug: 285166099
Flag: NA
Test: Manual
Change-Id: I69e594cbf3564a866d258654fc23a00410e7deab

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

@@ -391,7 +391,10 @@ public class ActivityAllAppsContainerView<T extends Context & ActivityContext>
                         rebindAdapters(false);
                         mRebindAdaptersAfterSearchAnimation = false;
                     }
-                    if (!goingToSearch) {
+
+                    if (goingToSearch) {
+                        mSearchUiDelegate.onAnimateToSearchStateCompleted();
+                    } else {
                         setSearchResults(null);
                         if (mViewPager != null) {
                             mViewPager.setCurrentPage(previousPage);