Use feature flag to enable view manager delegates for setting props

Summary: This diff adds a feature flag which must be enabled if view managers should be allowed to use a delegate for setting their properties.

Reviewed By: mdvacca

Differential Revision: D16762876

fbshipit-source-id: ae3466d7f02ed02f203dbb79f5e0843e6d9fdd45

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

@@ -47,4 +47,11 @@ public class ReactFeatureFlags {
    * This feature flag enables logs for Fabric
    */
   public static boolean enableFabricLogs = false;
+
+  /**
+   * Should this application use a {@link com.facebook.react.uimanager.ViewManagerDelegate} (if
+   * provided) to update the view properties. If {@code false}, then the generated {@code
+   * ...$$PropsSetter} class will be used instead.
+   */
+  public static boolean useViewManagerDelegates = false;
 }

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

@@ -14,6 +14,7 @@
 import com.facebook.react.bridge.ReactApplicationContext;
 import com.facebook.react.bridge.ReadableArray;
 import com.facebook.react.bridge.ReadableMap;
+import com.facebook.react.config.ReactFeatureFlags;
 import com.facebook.react.touch.JSResponderHandler;
 import com.facebook.react.touch.ReactInterceptingViewGroup;
 import com.facebook.react.uimanager.annotations.ReactProp;
@@ -40,8 +41,8 @@ public abstract class ViewManager<T extends View, C extends ReactShadowNode>
    * @param stateWrapper
    */
   public void updateProperties(@NonNull T viewToUpdate, ReactStylesDiffMap props) {
-    final ViewManagerDelegate<T> delegate = getDelegate();
-    if (delegate != null) {
+    final ViewManagerDelegate<T> delegate;
+    if (ReactFeatureFlags.useViewManagerDelegates && (delegate = getDelegate()) != null) {
       ViewManagerPropertyUpdater.updateProps(delegate, viewToUpdate, props);
     } else {
       ViewManagerPropertyUpdater.updateProps(this, viewToUpdate, props);