mus: Let clients set the cursor of their window.

components/mus/ws/connection_manager.h

Index: components/mus/ws/connection_manager.h
diff --git a/components/mus/ws/connection_manager.h b/components/mus/ws/connection_manager.h
index c9cd68a7c7c916688da38636281b414d013fbda6..28519be3467609ab570d7eeef6aab7fcf7931bed 100644
--- a/components/mus/ws/connection_manager.h
+++ b/components/mus/ws/connection_manager.h
@@ -158,6 +158,8 @@ class ConnectionManager : public ServerWindowDelegate,
                             const ServerWindow* relative_window,
                             const mojom::OrderDirection direction);
   void ProcessWindowDeleted(const WindowId& window);
+  void ProcessWillChangeWindowPredefinedCursor(ServerWindow* window,
+                                               int32_t cursor_id);
 
  private:
   friend class Operation;
@@ -225,6 +227,8 @@ class ConnectionManager : public ServerWindowDelegate,
       ServerWindow* window,
       const std::string& name,
       const std::vector<uint8_t>* new_data) override;
+  void OnWindowSetPredefinedCursor(ServerWindow* window,
+                                   int32_t cursor_id) override;
   void OnWindowTextInputStateChanged(ServerWindow* window,
                                      const ui::TextInputState& state) override;
   void OnTransientWindowAdded(ServerWindow* window,