Disables showing tooltips while a system menu is showing on windows

ui/views/win/hwnd_message_handler_delegate.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_VIEWS_WIN_HWND_MESSAGE_HANDLER_DELEGATE_H_
 #define UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_DELEGATE_H_
 
 #include "ui/views/views_export.h"
 
 namespace gfx {
@@ skipping 199 matching lines @@
   // Called to forward a WM_NOTIFY message to the tooltip manager.
   virtual bool HandleTooltipNotify(int w_param,
                                    NMHDR* l_param,
                                    LRESULT* l_result) = 0;
 
   // Called to forward mouse events to the tooltip manager.
   virtual void HandleTooltipMouseMove(UINT message,
                                       WPARAM w_param,
                                       LPARAM l_param) = 0;
 
+  // Invoked on entering/exiting a menu loop.
+  virtual void HandleMenuLoop(bool in_menu_loop) = 0;
+
   // Catch-all message handling and filtering. Called before
   // HWNDMessageHandler's built-in handling, which may pre-empt some
   // expectations in Views/Aura if messages are consumed. Returns true if the
   // message was consumed by the delegate and should not be processed further
   // by the HWNDMessageHandler. In this case, |result| is returned. |result| is
   // not modified otherwise.
   virtual bool PreHandleMSG(UINT message,
                             WPARAM w_param,
                             LPARAM l_param,
                             LRESULT* result) = 0;
 
   // Like PreHandleMSG, but called after HWNDMessageHandler's built-in handling
   // has run and after DefWindowProc.
   virtual void PostHandleMSG(UINT message,
                              WPARAM w_param,
                              LPARAM l_param) = 0;
 
  protected:
   virtual ~HWNDMessageHandlerDelegate() {}
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_DELEGATE_H_