mus: Let clients set the cursor of their window.

ui/views/mus/platform_window_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_PLATFORM_WINDOW_MUS_H_
 #define UI_VIEWS_MUS_PLATFORM_WINDOW_MUS_H_
 
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 #include "components/mus/public/cpp/window_observer.h"
 #include "ui/platform_window/platform_window.h"
 #include "ui/views/mus/mus_export.h"
 
 namespace views {
 
 class VIEWS_MUS_EXPORT PlatformWindowMus
     : public NON_EXPORTED_BASE(ui::PlatformWindow),
       public mus::WindowObserver {
  public:
   PlatformWindowMus(ui::PlatformWindowDelegate* delegate,
                     mus::Window* mus_window);
   ~PlatformWindowMus() override;
 
   void Activate();
 
+  void SetCursorById(mus::mojom::Cursor cursor);
+
   // ui::PlatformWindow:
   void Show() override;
   void Hide() override;
   void Close() override;
   void SetBounds(const gfx::Rect& bounds) override;
   gfx::Rect GetBounds() override;
   void SetTitle(const base::string16& title) override;
   void SetCapture() override;
   void ReleaseCapture() override;
   void ToggleFullscreen() override;
   void Maximize() override;
   void Minimize() override;
   void Restore() override;
   void SetCursor(ui::PlatformCursor cursor) override;
   void MoveCursorTo(const gfx::Point& location) override;
   void ConfineCursorToBounds(const gfx::Rect& bounds) override;
   ui::PlatformImeController* GetPlatformImeController() override;
 
  private:
   void SetShowState(mus::mojom::ShowState show_state);
 
   // mus::WindowObserver:
   void OnWindowDestroyed(mus::Window* window) override;
   void OnWindowBoundsChanged(mus::Window* window,
                              const gfx::Rect& old_bounds,
                              const gfx::Rect& new_bounds) override;
   void OnWindowFocusChanged(mus::Window* gained_focus,
                             mus::Window* lost_focus) override;
+  void OnWindowPredefinedCursorChanged(mus::Window* window,
+                                       mus::mojom::Cursor cursor) override;
   void OnWindowInputEvent(mus::Window* view,
                           const mus::mojom::EventPtr& event) override;
   void OnWindowSharedPropertyChanged(
       mus::Window* window,
       const std::string& name,
       const std::vector<uint8_t>* old_data,
       const std::vector<uint8_t>* new_data) override;
 
   ui::PlatformWindowDelegate* delegate_;
   mus::Window* mus_window_;
   mus::mojom::ShowState show_state_;
+  mus::mojom::Cursor last_cursor_;
   bool has_capture_;
 
   DISALLOW_COPY_AND_ASSIGN(PlatformWindowMus);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_MUS_PLATFORM_WINDOW_MUS_H_