mus: Use TooltipManagerAura in NativeWidgetMus.

ui/views/mus/window_manager_connection.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 UI_VIEWS_MUS_WINDOW_MANAGER_CONNECTION_H_
 #define UI_VIEWS_MUS_WINDOW_MANAGER_CONNECTION_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 79 matching lines @@
   // ui::WindowTreeClientDelegate:
   void OnEmbed(ui::Window* root) override;
   void OnLostConnection(ui::WindowTreeClient* client) override;
   void OnEmbedRootDestroyed(ui::Window* root) override;
   void OnPointerEventObserved(const ui::PointerEvent& event,
                               ui::Window* target) override;
 
   // ScreenMusDelegate:
   void OnWindowManagerFrameValuesChanged() override;
   gfx::Point GetCursorScreenPoint() override;
+  ui::Window* GetWindowAtScreenPoint(const gfx::Point& point) override;
 
   // ui:OSExchangeDataProviderFactory::Factory:
   std::unique_ptr<OSExchangeData::Provider> BuildProvider() override;
 
   shell::Connector* connector_;
   shell::Identity identity_;
   std::unique_ptr<ScreenMus> screen_;
   std::unique_ptr<ui::WindowTreeClient> client_;
   std::unique_ptr<ui::GpuService> gpu_service_;
   std::unique_ptr<PointerWatcherEventRouter> pointer_watcher_event_router_;
   std::unique_ptr<SurfaceContextFactory> compositor_context_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowManagerConnection);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_MUS_WINDOW_MANAGER_CONNECTION_H_