Enabled blocking access for animated queues under feature flag

Summary:
Blocks on queue write/drain for Animated module under a feature flag to test whether it resolves race conditions.

Changelog: [Internal]

Reviewed By: mdvacca

Differential Revision: D34752947

fbshipit-source-id: a1b1a286772d29a7a27b5e9c3f743cac84cc2bab

ReactAndroid/src/main/java/com/facebook/react/config/ReactFeatureFlags.java

@@ -71,6 +71,9 @@ public class ReactFeatureFlags {
   /** Feature flag to configure eager attachment of the root view/initialisation of the JS code */
   public static boolean enableEagerRootViewAttachment = false;
 
+  /** Feature flag to configure synchronized queue access for Animated module */
+  public static boolean enableSynchronizationForAnimated = false;
+
   private static boolean mapBufferSerializationEnabled = false;
 
   /** Enables or disables MapBuffer Serialization */