Animate TaskView as you swipe down on it to launch

Bug: 73835352
Change-Id: Ia255a7af8fb6cd972f99de6390e097afc29c1b90

src/com/android/launcher3/Launcher.java

@@ -1684,6 +1684,10 @@ public class Launcher extends BaseDraggingActivity implements LauncherExterns, L
                 : mAppTransitionManager.getActivityLaunchOptions(this, v);
     }
 
+    public LauncherAppTransitionManager getAppTransitionManager() {
+        return mAppTransitionManager;
+    }
+
     @TargetApi(Build.VERSION_CODES.M)
     @Override
     protected boolean onErrorStartingShortcut(Intent intent, ItemInfo info) {