Track animations and flush them

Summary:
Changelog: [Internal]

Track delete animations and when `manageChildren` is called on a certain view tag, finish all pending deletion animations before manipulating children

Reviewed By: JoshuaGross

Differential Revision: D20319824

fbshipit-source-id: b594d0e6e9b6fecc5eca2938f284be631494e55c

ReactAndroid/src/main/java/com/facebook/react/uimanager/NativeViewHierarchyManager.java

@@ -363,6 +363,8 @@ public class NativeViewHierarchyManager {
       @Nullable int[] tagsToDelete) {
     UiThreadUtil.assertOnUiThread();
 
+    mLayoutAnimator.cancelAnimationsForViewTag(tag);
+
     final ViewGroup viewToManage = (ViewGroup) mTagsToViews.get(tag);
     final ViewGroupManager viewManager = (ViewGroupManager) resolveViewManager(tag);
     if (viewToManage == null) {
@@ -445,6 +447,7 @@ public class NativeViewHierarchyManager {
 
         if (mLayoutAnimationEnabled && mLayoutAnimator.shouldAnimateLayout(viewToDestroy)) {
           mLayoutAnimator.deleteView(
+              tag,
               viewToDestroy,
               new LayoutAnimationListener() {
                 @Override