Add {Lock,Unlock,Show,Hide}Cursor() to the window manager mojom.

ash/aura/shell_port_classic.h

 // Copyright 2016 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 ASH_AURA_SHELL_PORT_CLASSIC_H_
 #define ASH_AURA_SHELL_PORT_CLASSIC_H_
 
 #include <memory>
 
 #include "ash/ash_export.h"
@@ skipping 29 matching lines @@
   const display::ManagedDisplayInfo& GetDisplayInfo(
       int64_t display_id) const override;
   bool IsActiveDisplayId(int64_t display_id) const override;
   display::Display GetFirstDisplay() const override;
   bool IsInUnifiedMode() const override;
   bool IsInUnifiedModeIgnoreMirroring() const override;
   void SetDisplayWorkAreaInsets(WmWindow* window,
                                 const gfx::Insets& insets) override;
   void LockCursor() override;
   void UnlockCursor() override;
+  void ShowCursor() override;
+  void HideCursor() override;
+  void SetGlobalOverrideCursor(base::Optional<ui::CursorData> cursor) override;
   bool IsMouseEventsEnabled() override;
   std::vector<WmWindow*> GetAllRootWindows() override;
   void RecordGestureAction(GestureActionType action) override;
   void RecordUserMetricsAction(UserMetricsAction action) override;
   void RecordTaskSwitchMetric(TaskSwitchSource source) override;
   std::unique_ptr<WindowResizer> CreateDragWindowResizer(
       std::unique_ptr<WindowResizer> next_window_resizer,
       wm::WindowState* window_state) override;
   std::unique_ptr<WindowCycleEventFilter> CreateWindowCycleEventFilter()
       override;
@@ skipping 40 matching lines @@
 
   std::unique_ptr<AcceleratorControllerDelegateAura>
       accelerator_controller_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellPortClassic);
 };
 
 }  // namespace ash
 
 #endif  // ASH_AURA_SHELL_PORT_CLASSIC_H_