mus: Let clients set the cursor of their window.

components/mus/ws/server_window_observer.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_OBSERVER_H_
 #define COMPONENTS_MUS_WS_SERVER_WINDOW_OBSERVER_H_
 
 #include "components/mus/public/interfaces/mus_constants.mojom.h"
 
 namespace gfx {
@@ skipping 38 matching lines @@
                                          const gfx::Insets& old_client_area,
                                          const gfx::Insets& new_client_area) {}
 
   virtual void OnWindowReordered(ServerWindow* window,
                                  ServerWindow* relative,
                                  mojom::OrderDirection direction) {}
 
   virtual void OnWillChangeWindowVisibility(ServerWindow* window) {}
   virtual void OnWindowVisibilityChanged(ServerWindow* window) {}
 
+  virtual void OnWindowCursorChanged(ServerWindow* window, int32_t cursor_id) {}

[sky, 2015/12/01 21:48:00]

Is there a reason you're not using standard here?

+
   virtual void OnWindowTextInputStateChanged(ServerWindow* window,
                                              const ui::TextInputState& state) {}
 
   virtual void OnWindowSharedPropertyChanged(
       ServerWindow* window,
       const std::string& name,
       const std::vector<uint8_t>* new_data) {}
 
   // Called when a transient child is added to |window|.
   virtual void OnTransientWindowAdded(ServerWindow* window,
                                       ServerWindow* transient_child) {}
 
   // Called when a transient child is removed from |window|.
   virtual void OnTransientWindowRemoved(ServerWindow* window,
                                         ServerWindow* transient_child) {}
 
  protected:
   virtual ~ServerWindowObserver() {}
 };
 
 }  // namespace ws
 
 }  // namespace mus
 
 #endif  // COMPONENTS_MUS_WS_SERVER_WINDOW_OBSERVER_H_