Marking that we process REQUEST_ENABLE_ROTATION

Bug: 187761685
Test: presubmit
Change-Id: I8239cd59dada685618fb273ef5840d30756ec84a
diff --git a/src/com/android/launcher3/testing/TestInformationHandler.java b/src/com/android/launcher3/testing/TestInformationHandler.java
index 9a34478..2c26b91 100644
--- a/src/com/android/launcher3/testing/TestInformationHandler.java
+++ b/src/com/android/launcher3/testing/TestInformationHandler.java
@@ -176,7 +176,7 @@
                 MAIN_EXECUTOR.submit(() ->
                         Launcher.ACTIVITY_TRACKER.getCreatedActivity().getRotationHelper()
                                 .forceAllowRotationForTesting(Boolean.parseBoolean(arg)));
-                return null;
+                return response;
 
             case TestProtocol.REQUEST_WORKSPACE_CELL_LAYOUT_SIZE:
                 return getLauncherUIProperty(Bundle::putIntArray, launcher -> {