Support calling start() in onAnimationFinished(...) in AVD

void PropertyValuesAnimatorSet::onFinished(BaseRenderNodeAnimator* animator) {

    if (mOneShotListener.get()) {

        mOneShotListener->onAnimationFinished(animator);

        sp<AnimationListener> listener = std::move(mOneShotListener);

        // Set the listener to nullptr before the onAnimationFinished callback, rather than after,

        // for two reasons:

        // 1) We need to prevent changes to mOneShotListener during the onAnimationFinished

        // callback (specifically in AnimationListenerBridge::onAnimationFinished(...) from

        // triggering dtor of the bridge and potentially unsafely re-entering

        // AnimationListenerBridge::onAnimationFinished(...).

        // 2) It's possible that there are changes to the listener during the callback, therefore

        // we need to reset the listener before the callback rather than afterwards.

        mOneShotListener = nullptr;

        listener->onAnimationFinished(animator);

    }

}