Call future listener on the same handler that created the controller

The direct executor is not the proper way to determine on what thread to run the
`Future.Listener` and the `MediaControllerCreationListener` because the listener
may call the controller passed as argument which must happen on the same thread
that built the controller. This change makes sure this is the case.

PiperOrigin-RevId: 490478587

libraries/test_session_current/src/androidTest/java/androidx/media3/session/MediaControllerTestRule.java

@@ -29,7 +29,6 @@
 import androidx.media3.test.session.common.HandlerThreadTestRule;
 import androidx.test.core.app.ApplicationProvider;
 import com.google.common.util.concurrent.ListenableFuture;
-import com.google.common.util.concurrent.MoreExecutors;
 import java.util.Map;
 import java.util.concurrent.ExecutionException;
 import org.junit.rules.ExternalResource;
@@ -206,7 +205,7 @@ private MediaController createControllerOnHandler(
               controllerCreationListener.onCreated(mediaController);
             }
           },
-          MoreExecutors.directExecutor());
+          handlerThreadTestRule.getHandler()::post);
     }
     return future.get(timeoutMs, MILLISECONDS);
   }