Add return animations to Toast search results.

This only applies to targets that already use the Animation library for
launch animations.

Bug: 336719605
Bug: 298089923
Flag: com.android.launcher3.enable_container_return_animations
Flag: com.android.systemui.shared.return_animation_framework_library
Test: tested manually with flag on and off
Change-Id: Ib824e78fa8b1b226b32d23d8325f06b496ba5deb

quickstep/src/com/android/launcher3/LauncherAnimationRunner.java

@@ -238,5 +238,12 @@ public class LauncherAnimationRunner extends RemoteAnimationRunnerCompat {
         @Override
         @UiThread
         default void onAnimationCancelled() {}
+
+        /**
+         * Returns whether this animation factory supports a tightly coupled return animation.
+         */
+        default boolean supportsReturnTransition() {
+            return false;
+        }
     }
 }