Add enableMountingCoordinatorPullModelAndroid feature flag (#57581)

Summary:

Adds the `enableMountingCoordinatorPullModelAndroid` experiment flag (default off) that gates the Android pull-model mounting migration. Config entry plus regenerated accessors only — no behavior change.

## Changelog:
[Android] [Added] - Add `enableMountingCoordinatorPullModelAndroid` feature flag

Reviewed By: rubennorte

Differential Revision: D112309049

Author: Bartlomiej Bloniarz

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/internal/featureflags/ReactNativeFeatureFlags.kt

@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<c5ce707ba940ef24ca6c261fd9b2baf7>>
+ * @generated SignedSource<<2544e292c44dabe82ad82a9b08a08f08>>
  */
 
 /**
@@ -252,6 +252,12 @@ public object ReactNativeFeatureFlags {
   @JvmStatic
   public fun enableModuleArgumentNSNullConversionIOS(): Boolean = accessor.enableModuleArgumentNSNullConversionIOS()
 
+  /**
+   * When enabled, Android mounts transactions with the pull model (like iOS): the commit thread no longer pulls and builds the mount batch in schedulerShouldRenderTransactions. Instead the UI thread pulls the transaction itself via a PullTransactionMountItem enqueued in the MountItemDispatcher, builds the IntBufferBatchMountItem, and applies it synchronously. Requires `enableAccumulatedUpdatesInRawPropsAndroid` to be enabled as well, since a single pull may collapse several commits into one diff and therefore needs complete accumulated rawProps; when used together with Props 2.0, also enable `enableExclusivePropsUpdateAndroid` and `enablePropsUpdateReconciliationAndroid`.
+   */
+  @JvmStatic
+  public fun enableMountingCoordinatorPullModelAndroid(): Boolean = accessor.enableMountingCoordinatorPullModelAndroid()
+
   /**
    * Enables the MutationObserver Web API in React Native.
    */

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/internal/featureflags/ReactNativeFeatureFlagsCxxAccessor.kt

@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<628ede95c745280c1ceaa73c6dc45de0>>
+ * @generated SignedSource<<3331513151f7b17e3902cceb65aaac1e>>
  */
 
 /**
@@ -57,6 +57,7 @@ internal class ReactNativeFeatureFlagsCxxAccessor : ReactNativeFeatureFlagsAcces
   private var enableLayoutAnimationsOnAndroidCache: Boolean? = null
   private var enableLayoutAnimationsOnIOSCache: Boolean? = null
   private var enableModuleArgumentNSNullConversionIOSCache: Boolean? = null
+  private var enableMountingCoordinatorPullModelAndroidCache: Boolean? = null
   private var enableMutationObserverByDefaultCache: Boolean? = null
   private var enableNativeCSSParsingCache: Boolean? = null
   private var enablePreparedTextLayoutCache: Boolean? = null
@@ -439,6 +440,15 @@ internal class ReactNativeFeatureFlagsCxxAccessor : ReactNativeFeatureFlagsAcces
     return cached
   }
 
+  override fun enableMountingCoordinatorPullModelAndroid(): Boolean {
+    var cached = enableMountingCoordinatorPullModelAndroidCache
+    if (cached == null) {
+      cached = ReactNativeFeatureFlagsCxxInterop.enableMountingCoordinatorPullModelAndroid()
+      enableMountingCoordinatorPullModelAndroidCache = cached
+    }
+    return cached
+  }
+
   override fun enableMutationObserverByDefault(): Boolean {
     var cached = enableMutationObserverByDefaultCache
     if (cached == null) {

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/internal/featureflags/ReactNativeFeatureFlagsCxxInterop.kt

@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<6a0e60fe118f3651dc76c895a37fbce2>>
+ * @generated SignedSource<<71e1be630ee2897f3546ccb23db60197>>
  */
 
 /**
@@ -102,6 +102,8 @@ public object ReactNativeFeatureFlagsCxxInterop {
 
   @DoNotStrip @JvmStatic public external fun enableModuleArgumentNSNullConversionIOS(): Boolean
 
+  @DoNotStrip @JvmStatic public external fun enableMountingCoordinatorPullModelAndroid(): Boolean
+
   @DoNotStrip @JvmStatic public external fun enableMutationObserverByDefault(): Boolean
 
   @DoNotStrip @JvmStatic public external fun enableNativeCSSParsing(): Boolean

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/internal/featureflags/ReactNativeFeatureFlagsDefaults.kt

@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<37e483d52d12a735e646c8ac06acb62c>>
+ * @generated SignedSource<<cdb20f0cac81beea272ca5de1c200e98>>
  */
 
 /**
@@ -97,6 +97,8 @@ public open class ReactNativeFeatureFlagsDefaults : ReactNativeFeatureFlagsProvi
 
   override fun enableModuleArgumentNSNullConversionIOS(): Boolean = false
 
+  override fun enableMountingCoordinatorPullModelAndroid(): Boolean = false
+
   override fun enableMutationObserverByDefault(): Boolean = false
 
   override fun enableNativeCSSParsing(): Boolean = false

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/internal/featureflags/ReactNativeFeatureFlagsLocalAccessor.kt

@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<5b7a6ca47ca43f473596e35dfced16e0>>
+ * @generated SignedSource<<1a62a0c778f72aa89ef4acea182f17c8>>
  */
 
 /**
@@ -61,6 +61,7 @@ internal class ReactNativeFeatureFlagsLocalAccessor : ReactNativeFeatureFlagsAcc
   private var enableLayoutAnimationsOnAndroidCache: Boolean? = null
   private var enableLayoutAnimationsOnIOSCache: Boolean? = null
   private var enableModuleArgumentNSNullConversionIOSCache: Boolean? = null
+  private var enableMountingCoordinatorPullModelAndroidCache: Boolean? = null
   private var enableMutationObserverByDefaultCache: Boolean? = null
   private var enableNativeCSSParsingCache: Boolean? = null
   private var enablePreparedTextLayoutCache: Boolean? = null
@@ -480,6 +481,16 @@ internal class ReactNativeFeatureFlagsLocalAccessor : ReactNativeFeatureFlagsAcc
     return cached
   }
 
+  override fun enableMountingCoordinatorPullModelAndroid(): Boolean {
+    var cached = enableMountingCoordinatorPullModelAndroidCache
+    if (cached == null) {
+      cached = currentProvider.enableMountingCoordinatorPullModelAndroid()
+      accessedFeatureFlags.add("enableMountingCoordinatorPullModelAndroid")
+      enableMountingCoordinatorPullModelAndroidCache = cached
+    }
+    return cached
+  }
+
   override fun enableMutationObserverByDefault(): Boolean {
     var cached = enableMutationObserverByDefaultCache
     if (cached == null) {

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/internal/featureflags/ReactNativeFeatureFlagsProvider.kt

@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<ee254c53ae1b4bc03045926028e898e5>>
+ * @generated SignedSource<<3caf8a7b3aea3b40ff888e5f7f81e90d>>
  */
 
 /**
@@ -97,6 +97,8 @@ public interface ReactNativeFeatureFlagsProvider {
 
   @DoNotStrip public fun enableModuleArgumentNSNullConversionIOS(): Boolean
 
+  @DoNotStrip public fun enableMountingCoordinatorPullModelAndroid(): Boolean
+
   @DoNotStrip public fun enableMutationObserverByDefault(): Boolean
 
   @DoNotStrip public fun enableNativeCSSParsing(): Boolean

packages/react-native/ReactAndroid/src/main/jni/react/featureflags/JReactNativeFeatureFlagsCxxInterop.cpp

@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<41ff49e9305aa1ff144582dfcac650d0>>
+ * @generated SignedSource<<1e6921044c4f10ecc5a5263b671772a2>>
  */
 
 /**
@@ -261,6 +261,12 @@ class ReactNativeFeatureFlagsJavaProvider
     return method(javaProvider_);
   }
 
+  bool enableMountingCoordinatorPullModelAndroid() override {
+    static const auto method =
+        getReactNativeFeatureFlagsProviderJavaClass()->getMethod<jboolean()>("enableMountingCoordinatorPullModelAndroid");
+    return method(javaProvider_);
+  }
+
   bool enableMutationObserverByDefault() override {
     static const auto method =
         getReactNativeFeatureFlagsProviderJavaClass()->getMethod<jboolean()>("enableMutationObserverByDefault");
@@ -738,6 +744,11 @@ bool JReactNativeFeatureFlagsCxxInterop::enableModuleArgumentNSNullConversionIOS
   return ReactNativeFeatureFlags::enableModuleArgumentNSNullConversionIOS();
 }
 
+bool JReactNativeFeatureFlagsCxxInterop::enableMountingCoordinatorPullModelAndroid(
+    facebook::jni::alias_ref<JReactNativeFeatureFlagsCxxInterop> /*unused*/) {
+  return ReactNativeFeatureFlags::enableMountingCoordinatorPullModelAndroid();
+}
+
 bool JReactNativeFeatureFlagsCxxInterop::enableMutationObserverByDefault(
     facebook::jni::alias_ref<JReactNativeFeatureFlagsCxxInterop> /*unused*/) {
   return ReactNativeFeatureFlags::enableMutationObserverByDefault();
@@ -1120,6 +1131,9 @@ void JReactNativeFeatureFlagsCxxInterop::registerNatives() {
       makeNativeMethod(
         "enableModuleArgumentNSNullConversionIOS",
         JReactNativeFeatureFlagsCxxInterop::enableModuleArgumentNSNullConversionIOS),
+      makeNativeMethod(
+        "enableMountingCoordinatorPullModelAndroid",
+        JReactNativeFeatureFlagsCxxInterop::enableMountingCoordinatorPullModelAndroid),
       makeNativeMethod(
         "enableMutationObserverByDefault",
         JReactNativeFeatureFlagsCxxInterop::enableMutationObserverByDefault),

packages/react-native/ReactAndroid/src/main/jni/react/featureflags/JReactNativeFeatureFlagsCxxInterop.h

@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<9c5bd61122f068c919c70399828585d1>>
+ * @generated SignedSource<<28884240a4d0cedf7e1ecfaf34378f8e>>
  */
 
 /**
@@ -141,6 +141,9 @@ class JReactNativeFeatureFlagsCxxInterop
   static bool enableModuleArgumentNSNullConversionIOS(
     facebook::jni::alias_ref<JReactNativeFeatureFlagsCxxInterop>);
 
+  static bool enableMountingCoordinatorPullModelAndroid(
+    facebook::jni::alias_ref<JReactNativeFeatureFlagsCxxInterop>);
+
   static bool enableMutationObserverByDefault(
     facebook::jni::alias_ref<JReactNativeFeatureFlagsCxxInterop>);
 

packages/react-native/ReactCommon/react/featureflags/ReactNativeFeatureFlags.cpp

@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<77401595559dc52e1b2b206527deb341>>
+ * @generated SignedSource<<c7589193e853646b63d50a4431647521>>
  */
 
 /**
@@ -174,6 +174,10 @@ bool ReactNativeFeatureFlags::enableModuleArgumentNSNullConversionIOS() {
   return getAccessor().enableModuleArgumentNSNullConversionIOS();
 }
 
+bool ReactNativeFeatureFlags::enableMountingCoordinatorPullModelAndroid() {
+  return getAccessor().enableMountingCoordinatorPullModelAndroid();
+}
+
 bool ReactNativeFeatureFlags::enableMutationObserverByDefault() {
   return getAccessor().enableMutationObserverByDefault();
 }

packages/react-native/ReactCommon/react/featureflags/ReactNativeFeatureFlags.h

@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<df8968adcf11283d6745bb2e0f5f7a5b>>
+ * @generated SignedSource<<214d05a6296f10f2a7ac67a15dc66d1c>>
  */
 
 /**
@@ -224,6 +224,11 @@ class ReactNativeFeatureFlags {
    */
   RN_EXPORT static bool enableModuleArgumentNSNullConversionIOS();
 
+  /**
+   * When enabled, Android mounts transactions with the pull model (like iOS): the commit thread no longer pulls and builds the mount batch in schedulerShouldRenderTransactions. Instead the UI thread pulls the transaction itself via a PullTransactionMountItem enqueued in the MountItemDispatcher, builds the IntBufferBatchMountItem, and applies it synchronously. Requires `enableAccumulatedUpdatesInRawPropsAndroid` to be enabled as well, since a single pull may collapse several commits into one diff and therefore needs complete accumulated rawProps; when used together with Props 2.0, also enable `enableExclusivePropsUpdateAndroid` and `enablePropsUpdateReconciliationAndroid`.
+   */
+  RN_EXPORT static bool enableMountingCoordinatorPullModelAndroid();
+
   /**
    * Enables the MutationObserver Web API in React Native.
    */