Detect if osk is visible on windows

ui/base/win/osk_display_manager.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 UI_BASE_WIN_OSK_DISPLAY_MANAGER_H_
 #define UI_BASE_WIN_OSK_DISPLAY_MANAGER_H_
 
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "base/strings/string16.h"
@@ skipping 23 matching lines @@
   bool DismissVirtualKeyboard();
 
   // Removes a registered observer.
   void RemoveObserver(OnScreenKeyboardObserver* observer);
 
   // Returns the path of the on screen keyboard exe (TabTip.exe) in the
   // |osk_path| parameter.
   // Returns true on success.
   bool GetOSKPath(base::string16* osk_path);
 
+  // Returns true if the virtual keyboard is currently visible.
+  bool IsKeyboardVisible() const;
+
  private:
   OnScreenKeyboardDisplayManager();
 
   std::unique_ptr<OnScreenKeyboardDetector> keyboard_detector_;
 
   // The location of TabTip.exe.
   base::string16 osk_path_;
 
   DISALLOW_COPY_AND_ASSIGN(OnScreenKeyboardDisplayManager);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_WIN_OSK_DISPLAY_MANAGER_H_