Introduce CatalystInstance.getNativeCallInvokerHolder()

Summary: CatalystInstanceImpl is responsible for creating the NativeModules thread. We therefore expose a method `getNativeCallInvokerHolder()` on this hybrid class to create and give us access to the `CallInvokerHolder` for the NativeModules thread.

Reviewed By: PeteTheHeat

Differential Revision: D17422164

fbshipit-source-id: 316423847518124115643549fa73a8533d493cd0

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

@@ -107,11 +107,17 @@ public interface CatalystInstance
   void addJSIModules(List<JSIModuleSpec> jsiModules);
 
   /**
-   * Returns a hybrid object that contains a pointer to JSCallInvoker. Required for
-   * TurboModuleManager initialization.
+   * Returns a hybrid object that contains a pointer to a JS CallInvoker, which is used to schedule
+   * work on the JS Thread. Required for TurboModuleManager initialization.
    */
   CallInvokerHolder getJSCallInvokerHolder();
 
+  /**
+   * Returns a hybrid object that contains a pointer to a Native CallInvoker, which is used to
+   * schedule work on the NativeModules thread. Required for TurboModuleManager initialization.
+   */
+  CallInvokerHolder getNativeCallInvokerHolder();
+
   /**
    * For the time being, we want code relying on the old infra to also work with TurboModules.
    * Hence, we must provide the TurboModuleRegistry to CatalystInstance so that getNativeModule,

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

@@ -109,6 +109,8 @@ public class CatalystInstanceImpl implements CatalystInstance {
 
   public native CallInvokerHolderImpl getJSCallInvokerHolder();
 
+  public native CallInvokerHolderImpl getNativeCallInvokerHolder();
+
   private CatalystInstanceImpl(
       final ReactQueueConfigurationSpec reactQueueConfigurationSpec,
       final JavaScriptExecutor jsExecutor,