Add empty addTransactionCommittedListener for StubTransaction

To avoid calling real method which may run the listener on a dead
handler which was terminated by test. That crashes the test process.

(TransitionTests#testFixedRotationOpen uses the stub transaction
to onRotationTransactionReady -> addTransactionCommittedListener)

Bug: 221223435
Test: atest TransitionTests
Change-Id: Ie967814cebf8f33563184c6a98ed4e670e7a8056

services/tests/wmtests/src/com/android/server/wm/StubTransaction.java

@@ -28,6 +28,8 @@ import android.view.InputWindowHandle;
 import android.view.Surface;
 import android.view.SurfaceControl;
 
+import java.util.concurrent.Executor;
+
 /**
  * Stubbed {@link android.view.SurfaceControl.Transaction} class that can be used when unit
  * testing to avoid calls to native code.
@@ -218,6 +220,12 @@ public class StubTransaction extends SurfaceControl.Transaction {
         return this;
     }
 
+    @Override
+    public SurfaceControl.Transaction addTransactionCommittedListener(Executor executor,
+            SurfaceControl.TransactionCommittedListener listener) {
+        return this;
+    }
+
     @Override
     public SurfaceControl.Transaction syncInputWindows() {
         return this;