Make Animators pass internal tests

Fixes: 269524599

AnimatorSet wasn't properly managing cloning and
ViewPropertyAnimatorTest didn't work when the animator took too
long to start. This CL fixes both problems.

Test: ran animation tests
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:9cbebf9fb2066cf8765ba794a9181c6e6fca2ca4)
Merged-In: Icdf2e9d75d93fa6a4e99833c24a40b48b051f568
Change-Id: Icdf2e9d75d93fa6a4e99833c24a40b48b051f568

core/java/android/animation/AnimatorSet.java

@@ -1503,6 +1503,7 @@ public final class AnimatorSet extends Animator implements AnimationHandler.Anim
         anim.mNodeMap = new ArrayMap<Animator, Node>();
         anim.mNodes = new ArrayList<Node>(nodeCount);
         anim.mEvents = new ArrayList<AnimationEvent>();
+        anim.mStartListenersCalled = false;
         anim.mAnimationEndListener = new AnimatorListenerAdapter() {
             @Override
             public void onAnimationEnd(Animator animation) {

core/tests/coretests/src/android/animation/ViewPropertyAnimatorTest.java

@@ -135,11 +135,15 @@ public class ViewPropertyAnimatorTest {
      * @throws Exception
      */
     @Before
-    public void setUp() throws Exception {
+    public void setUp() throws Throwable {
         final BasicAnimatorActivity activity = mActivityRule.getActivity();
         Button button = activity.findViewById(R.id.animatingButton);
 
         mAnimator = button.animate().x(100).y(100);
+        mActivityRule.runOnUiThread(() -> {
+            mAnimator.start();
+            mAnimator.cancel();
+        });
 
         // mListener is the main testing mechanism of this file. The asserts of each test
         // are embedded in the listener callbacks that it implements.