EventDispatcher shouldn't always cancel on a hierarchy change

components/mus/ws/server_window_surface_manager_test_api.h

 // 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.
 
 #ifndef COMPONENTS_MUS_WS_SERVER_WINDOW_SURFACE_MANAGER_TEST_API_H_
 #define COMPONENTS_MUS_WS_SERVER_WINDOW_SURFACE_MANAGER_TEST_API_H_
 
 #include "base/macros.h"
 #include "components/mus/ws/server_window_surface_manager.h"
 
 namespace mus {
 namespace ws {
 
 class ServerWindow;
 
 // Use to poke at the internals of ServerWindowSurfaceManager.
 class ServerWindowSurfaceManagerTestApi {
  public:
   explicit ServerWindowSurfaceManagerTestApi(
       ServerWindowSurfaceManager* manager);
   ~ServerWindowSurfaceManagerTestApi();
 
   void CreateEmptyDefaultSurface();
+  void DestroyDefaultSurface();
 
  private:
   ServerWindowSurfaceManager* manager_;
 
   DISALLOW_COPY_AND_ASSIGN(ServerWindowSurfaceManagerTestApi);
 };
 
 // Use to make |window| a target for events.
 void EnableHitTest(ServerWindow* window);
+void DisableHitTest(ServerWindow* window);
 
 }  // namespace ws
 }  // namespace mus
 
 #endif  // COMPONENTS_MUS_WS_SERVER_WINDOW_SURFACE_MANAGER_TEST_API_H_