EventDispatcher shouldn't always cancel on a hierarchy change

components/mus/ws/server_window_surface_manager_test_api.cc

Index: components/mus/ws/server_window_surface_manager_test_api.cc
diff --git a/components/mus/ws/server_window_surface_manager_test_api.cc b/components/mus/ws/server_window_surface_manager_test_api.cc
index 38aba1242038c7b31efa83366c7ca88c684fb22c..d65ae0f6376878dc5c9688fcf96044976fa8f7bd 100644
--- a/components/mus/ws/server_window_surface_manager_test_api.cc
+++ b/components/mus/ws/server_window_surface_manager_test_api.cc
@@ -19,11 +19,21 @@ void ServerWindowSurfaceManagerTestApi::CreateEmptyDefaultSurface() {
   manager_->type_to_surface_map_[mojom::SurfaceType::DEFAULT] = nullptr;
 }
 
+void ServerWindowSurfaceManagerTestApi::DestroyDefaultSurface() {
+  manager_->type_to_surface_map_.erase(mojom::SurfaceType::DEFAULT);
+}
+
 void EnableHitTest(ServerWindow* window) {
   ServerWindowSurfaceManagerTestApi test_api(
       window->GetOrCreateSurfaceManager());
   test_api.CreateEmptyDefaultSurface();
 }
 
+void DisableHitTest(ServerWindow* window) {
+  ServerWindowSurfaceManagerTestApi test_api(
+      window->GetOrCreateSurfaceManager());
+  test_api.DestroyDefaultSurface();
+}
+
 }  // namespace ws
 }  // namespace mus