Work around a bug in an An app

An app has Animators (NoPauseAnimatorWrapper) that does not
check their listeners against null before cloning. The previous
implementation of AnimatorSet has masked this issue. But the
underlying bug should be fixed in this app.

For now, work around the bug by adding a listener to all the child
animators.

BUG: 34736819
Test: Manual

Change-Id: I968450aab62cf5d308e3b64e76dcf018178af67e