Implement and test aura::client::CaptureClient in views::NativeWidgetMus for plumbing (Set|Release)…

ui/views/mus/native_widget_mus.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_NATIVE_WIDGET_MUS_H_
 #define UI_VIEWS_MUS_NATIVE_WIDGET_MUS_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 209 matching lines @@
   // Overridden from mus::InputEventHandler:
   void OnWindowInputEvent(
       mus::Window* view,
       const ui::Event& event,
       std::unique_ptr<base::Callback<void(mus::mojom::EventResult)>>*
           ack_callback) override;
 
 private:
   friend class NativeWidgetMusTest;
   class MusWindowObserver;
+  class MusCaptureClient;
 
   ui::PlatformWindowDelegate* platform_window_delegate() {
     return window_tree_host();
   }
 
   void set_last_cursor(mus::mojom::Cursor cursor) { last_cursor_ = cursor; }
   void SetShowState(mus::mojom::ShowState show_state);
 
   void OnMusWindowVisibilityChanging(mus::Window* window);
   void OnMusWindowVisibilityChanged(mus::Window* window);
@@ skipping 11 matching lines @@
 
   // Functions with the same name require the mus::WindowObserver to be in
   // a separate class.
   std::unique_ptr<MusWindowObserver> mus_window_observer_;
 
   // Aura configuration.
   std::unique_ptr<SurfaceContextFactory> context_factory_;
   std::unique_ptr<WindowTreeHostMus> window_tree_host_;
   aura::Window* content_;
   std::unique_ptr<wm::FocusController> focus_client_;
-  std::unique_ptr<aura::client::DefaultCaptureClient> capture_client_;
+  std::unique_ptr<MusCaptureClient> capture_client_;
   std::unique_ptr<aura::client::WindowTreeClient> window_tree_client_;
   std::unique_ptr<aura::client::ScreenPositionClient> screen_position_client_;
   std::unique_ptr<wm::CursorManager> cursor_manager_;
   base::WeakPtrFactory<NativeWidgetMus> close_widget_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeWidgetMus);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_MUS_NATIVE_WIDGET_MUS_H_