Refactor preComputeConstantsForViewManager to avoid loading UIManagerModule in Fabric

Summary:
This method refactors the preComputeConstantsForViewManager to avoid loading UIManagerModule when using  Fabric + Static View configs

changelog: [internal] internal

Reviewed By: shergin

Differential Revision: D25468182

fbshipit-source-id: e95b0e7d013e832792fb77fc0b6e5705d7f04868

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

@@ -14,6 +14,7 @@ import androidx.annotation.AnyThread;
 import androidx.annotation.Nullable;
 import androidx.annotation.UiThread;
 import com.facebook.infer.annotation.ThreadConfined;
+import java.util.List;
 
 public interface UIManager extends JSIModule, PerformanceCounter {
 
@@ -129,4 +130,15 @@ public interface UIManager extends JSIModule, PerformanceCounter {
   @Deprecated
   @Nullable
   String resolveCustomDirectEventName(@Nullable String eventName);
+
+  /**
+   * Helper method to pre-initialize view managers. When using Native ViewConfigs this method will
+   * also pre-compute the constants for a view manager. The purpose is to ensure that we don't block
+   * for getting the constants for view managers during initial rendering of a surface.
+   *
+   * @deprecated this method will be removed in the future
+   * @param viewManagerNames {@link List <String>} names of ViewManagers
+   */
+  @Deprecated
+  void preInitializeViewManagers(List<String> viewManagerNames);
 }

ReactAndroid/src/main/java/com/facebook/react/fabric/FabricUIManager.java

@@ -229,6 +229,13 @@ public class FabricUIManager implements UIManager, LifecycleEventListener {
     return rootTag;
   }
 
+  @Override
+  public void preInitializeViewManagers(List<String> viewManagerNames) {
+    for (String viewManagerName : viewManagerNames) {
+      mMountingManager.initializeViewManager(viewManagerName);
+    }
+  }
+
   @Override
   @AnyThread
   @ThreadConfined(ANY)

ReactAndroid/src/main/java/com/facebook/react/fabric/mounting/MountingManager.java

@@ -782,6 +782,10 @@ public class MountingManager {
     return viewState == null ? null : viewState.mEventEmitter;
   }
 
+  public void initializeViewManager(String componentName) {
+    mViewManagerRegistry.get(componentName);
+  }
+
   /**
    * This class holds view state for react tags. Objects of this class are stored into the {@link
    * #mTagToViewState}, and they should be updated in the same thread.

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

@@ -294,14 +294,16 @@ public class UIManagerModule extends ReactContextBaseJavaModule
    * Helper method to pre-compute the constants for a view manager. This method ensures that we
    * don't block for getting the constants for view managers during TTI
    *
-   * @deprecated this method will not be available in FabricUIManager class.
+   * @deprecated this method will be removed in the future
    * @param viewManagerNames {@link List<String>} names of ViewManagers
    */
   @Deprecated
-  public void preComputeConstantsForViewManager(List<String> viewManagerNames) {
-    // TODO T81145457 - Implement pre-initialization of ViewManagers in Fabric Android
+  @Override
+  public void preInitializeViewManagers(List<String> viewManagerNames) {
     if (ReactFeatureFlags.enableExperimentalStaticViewConfigs) {
-      preInitializeViewManagers(viewManagerNames);
+      for (String viewManagerName : viewManagerNames) {
+        mUIImplementation.resolveViewManager(viewManagerName);
+      }
       // When Static view configs are enabled it is not necessary to pre-compute the constants for
       // viewManagers, although the pre-initialization of viewManager objects is still necessary
       // for performance reasons.
@@ -326,12 +328,6 @@ public class UIManagerModule extends ReactContextBaseJavaModule
     mViewManagerConstantsCache = Collections.unmodifiableMap(constantsMap);
   }
 
-  private void preInitializeViewManagers(List<String> viewManagerNames) {
-    for (String viewManagerName : viewManagerNames) {
-      mUIImplementation.resolveViewManager(viewManagerName);
-    }
-  }
-
   @ReactMethod(isBlockingSynchronousMethod = true)
   public @Nullable WritableMap getConstantsForViewManager(@Nullable String viewManagerName) {
     if (mViewManagerConstantsCache != null