Adding @CountEnum to simple enums in xplat/js

Summary: Using The Count to transform enums to ints in production builds: https://our.intern.facebook.com/intern/wiki/Android-java-transforms/the-count/

Reviewed By: achen1

Differential Revision: D9614432

fbshipit-source-id: 1b1a197ad8f4962712d6006ab07b3beb3eaf2432

ReactAndroid/src/main/java/com/facebook/react/bridge/JsonWriter.java

@@ -13,6 +13,8 @@ import java.io.Writer;
 import java.util.ArrayDeque;
 import java.util.Deque;
 
+import com.facebook.thecount.api.CountEnum;
+
 /**
  * Simple Json generator that does no validation.
  */
@@ -207,6 +209,7 @@ public class JsonWriter implements Closeable {
     mScopes.push(scope);
   }
 
+  @CountEnum
   private enum Scope {
     EMPTY_OBJECT,
     OBJECT,