Make setJSEngineResolutionAlgorithm a public method (#36715)

Summary:
`setJSEngineResolutionAlgorithm` is marked as private while it looks like it was intended to be public.
While the current implementation does not cause any issues as such, but in brownfield we will have the option to explicitly set the JS engine to hermes or jsc when initialising the ReactInstanceBuilder.

Right now, we look if the engine is set and if unset we look for the jsc engine. If jsc is not present we select hermes and this process unnecessary throws a warning.

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[ANDROID][FIXED] - Changed the scope of `setJSEngineResolutionAlgorithm` to public from private. Brownfield apps should be able to setup the JSResolutionAlgorithm before hand.

Pull Request resolved: https://github.com/facebook/react-native/pull/36715

Reviewed By: cortinico

Differential Revision: D44535444

Pulled By: javache

fbshipit-source-id: ae91e50de10c993c80ed4bba6f2fece64af178c4

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/ReactInstanceManagerBuilder.java

@@ -69,7 +69,7 @@ public class ReactInstanceManagerBuilder {
   private @Nullable ReactPackageTurboModuleManagerDelegate.Builder mTMMDelegateBuilder;
   private @Nullable SurfaceDelegateFactory mSurfaceDelegateFactory;
   private @Nullable DevLoadingViewManager mDevLoadingViewManager;
-  private JSEngineResolutionAlgorithm jsEngineResolutionAlgorithm = null;
+  private @Nullable JSEngineResolutionAlgorithm mJSEngineResolutionAlgorithm = null;
 
   /* package protected */ ReactInstanceManagerBuilder() {}
 
@@ -126,9 +126,10 @@ public class ReactInstanceManagerBuilder {
    * Sets the JS Engine to load as either Hermes or JSC. If not set, the default is JSC with a
    * Hermes fallback.
    */
-  private void setJSEngineResolutionAlgorithm(
+  public ReactInstanceManagerBuilder setJSEngineResolutionAlgorithm(
       @Nullable JSEngineResolutionAlgorithm jsEngineResolutionAlgorithm) {
-    this.jsEngineResolutionAlgorithm = jsEngineResolutionAlgorithm;
+    mJSEngineResolutionAlgorithm = jsEngineResolutionAlgorithm;
+    return this;
   }
 
   /**
@@ -362,7 +363,7 @@ public class ReactInstanceManagerBuilder {
 
     // if nothing is specified, use old loading method
     // else load the required engine
-    if (jsEngineResolutionAlgorithm == null) {
+    if (mJSEngineResolutionAlgorithm == null) {
       FLog.w(
           TAG,
           "You're not setting the JS Engine Resolution Algorithm. "
@@ -379,7 +380,7 @@ public class ReactInstanceManagerBuilder {
         HermesExecutor.loadLibrary();
         return new HermesExecutorFactory();
       }
-    } else if (jsEngineResolutionAlgorithm == JSEngineResolutionAlgorithm.HERMES) {
+    } else if (mJSEngineResolutionAlgorithm == JSEngineResolutionAlgorithm.HERMES) {
       HermesExecutor.loadLibrary();
       return new HermesExecutorFactory();
     } else {

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/ReactNativeHost.java

@@ -81,7 +81,8 @@ public abstract class ReactNativeHost {
             .setJSIModulesPackage(getJSIModulePackage())
             .setInitialLifecycleState(LifecycleState.BEFORE_CREATE)
             .setReactPackageTurboModuleManagerDelegateBuilder(
-                getReactPackageTurboModuleManagerDelegateBuilder());
+                getReactPackageTurboModuleManagerDelegateBuilder())
+            .setJSEngineResolutionAlgorithm(getJSEngineResolutionAlgorithm());
 
     for (ReactPackage reactPackage : getPackages()) {
       builder.addPackage(reactPackage);