Back out "[react-native] Remove experimental gating for LayoutAnimation on Android"

Summary: We've identified a couple of remaining issues that need to be re-tested before we can ship this more broadly.

Reviewed By: fred2028

Differential Revision: D14775730

fbshipit-source-id: 22402149066c5fbe72c36fcf7f547d63feaf5241

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

@@ -693,6 +693,21 @@ public class UIImplementation {
     }
   }
 
+  /**
+   * LayoutAnimation API on Android is currently experimental. Therefore, it needs to be enabled
+   * explicitly in order to avoid regression in existing application written for iOS using this API.
+   *
+   * Warning : This method will be removed in future version of React Native, and layout animation
+   * will be enabled by default, so always check for its existence before invoking it.
+   *
+   * TODO(9139831) : remove this method once layout animation is fully stable.
+   *
+   * @param enabled whether layout animation is enabled or not
+   */
+  public void setLayoutAnimationEnabledExperimental(boolean enabled) {
+    mOperationsQueue.enqueueSetLayoutAnimationEnabled(enabled);
+  }
+
   /**
    * Configure an animation to be used for the native layout changes, and native views
    * creation. The animation will only apply during the current batch operations.