Make the cursor have separate mode for disabled mouse events and invisible.

ui/aura/client/cursor_client.h

 // Copyright (c) 2012 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_AURA_CLIENT_CURSOR_CLIENT_H_
 #define UI_AURA_CLIENT_CURSOR_CLIENT_H_
 
 #include "ui/aura/aura_export.h"
 #include "ui/gfx/native_widget_types.h"
 
 namespace aura {
 class Window;
 namespace client {
 
 // An interface that receives cursor change events.
 class AURA_EXPORT CursorClient {
  public:
   // Notes that |window| has requested the change to |cursor|.
   virtual void SetCursor(gfx::NativeCursor cursor) = 0;
 
-  // Changes the visibility of the cursor.
-  virtual void ShowCursor(bool show) = 0;
+  // Shows the cursor. This does not take effect When mouse events are disabled.
+  virtual void ShowCursor() = 0;
+
+  // Hides the cursor. Mouse events keep being sent even when the cursor is
+  // invisible.
+  virtual void HideCursor() = 0;
 
   // Gets whether the cursor is visible.
   virtual bool IsCursorVisible() const = 0;
 
+  // Makes mouse events start being sent and shows the cursor if it was hidden
+  // with DisableMouseEvents.
+  virtual void EnableMouseEvents() = 0;
+
+  // Makes mouse events stop being sent and hides the cursor if it is visible.
+  virtual void DisableMouseEvents() = 0;
+
+  // Returns true if mouse events are enabled.
+  virtual bool IsMouseEventsEnabled() const = 0;
+
   // Sets the device scale factor of the cursor.
   virtual void SetDeviceScaleFactor(float device_scale_factor) = 0;
 
-  // Locks the cursor change. The cursor type and cursor visibility never change
-  // as long as lock is held by anyone.
+  // Locks the cursor change. The cursor type, cursor visibility, and mouse
+  // events enable state never change as long as lock is held by anyone.
   virtual void LockCursor() = 0;
 
-  // Unlocks the cursor change. If all the locks are released, the cursor type
-  // and visibility are restored to the ones set by the lastest call of
-  // SetCursor and ShowCursor.
+  // Unlocks the cursor change. If all the locks are released, the cursor type,
+  // cursor visibility, and mouse events enable state are restored to the ones
+  // set by the lastest call of SetCursor, ShowCursor/HideCursor, and
+  // EnableMouseEvents/DisableMouseEvents.
   virtual void UnlockCursor() = 0;
 
  protected:
   virtual ~CursorClient() {}
 };
 
 // Sets/Gets the activation client for the specified window.
 AURA_EXPORT void SetCursorClient(Window* window,
                                  CursorClient* client);
 AURA_EXPORT CursorClient* GetCursorClient(Window* window);
 
 }  // namespace client
 }  // namespace aura
 
 #endif  // UI_AURA_CLIENT_CURSOR_CLIENT_H_