EventDispatcher shouldn't always cancel on a hierarchy change

components/mus/ws/server_window_surface_manager_test_api.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/mus/ws/server_window_surface_manager_test_api.h"
 
 #include "components/mus/ws/server_window.h"
 
 namespace mus {
 namespace ws {
 
 ServerWindowSurfaceManagerTestApi::ServerWindowSurfaceManagerTestApi(
     ServerWindowSurfaceManager* manager)
     : manager_(manager) {}
 
 ServerWindowSurfaceManagerTestApi::~ServerWindowSurfaceManagerTestApi() {}
 
 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