feat(pressability): gate native hierarchy measurement

Author: hannojg

packages/react-native/Libraries/Pressability/Pressability.js

@@ -804,8 +804,12 @@ export default class Pressability {
 
     if (typeof this._responderID === 'number') {
       UIManager.measure(this._responderID, this._measureCallback);
-    } else {
+    } else if (
+      ReactNativeFeatureFlags.shouldPressabilityUseNativeViewHierarchyForMeasurement()
+    ) {
       this._responderID.measureAsyncOnUI(this._measureCallback);
+    } else {
+      this._responderID.measure(this._measureCallback);
     }
   }
 

packages/react-native/scripts/featureflags/ReactNativeFeatureFlags.config.js

@@ -1067,6 +1067,17 @@ const definitions: FeatureFlagDefinitions = {
       },
       ossReleaseStage: 'none',
     },
+    shouldPressabilityUseNativeViewHierarchyForMeasurement: {
+      defaultValue: false,
+      metadata: {
+        dateAdded: '2026-06-18',
+        description:
+          'When enabled, Pressability measures host instances from the native view hierarchy on the UI thread instead of using shadow tree layout metrics.',
+        expectedReleaseValue: true,
+        purpose: 'experimentation',
+      },
+      ossReleaseStage: 'none',
+    },
     shouldUseAnimatedObjectForTransform: {
       defaultValue: false,
       metadata: {