[FYI] All-in-one OnCandidateWindow{Show,Update,Hide}

ui/base/ime/input_method_base.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_BASE_IME_INPUT_METHOD_BASE_H_
 #define UI_BASE_IME_INPUT_METHOD_BASE_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/observer_list.h"
@@ skipping 72 matching lines @@
                                          KeyboardCode key_code,
                                          int flags) const;
 
   // Convenience method to notify all observers of TextInputClient changes.
   void NotifyTextInputStateChanged(const TextInputClient* client);
 
   bool system_toplevel_window_focused() const {
     return system_toplevel_window_focused_;
   }
 
+  void NotifyCandidateWindowStateChanged();
+
  private:
   void SetFocusedTextInputClientInternal(TextInputClient* client);
 
   internal::InputMethodDelegate* delegate_;
   TextInputClient* text_input_client_;
 
   ObserverList<InputMethodObserver> observer_list_;
 
   bool system_toplevel_window_focused_;
 
+  bool is_candidate_popup_open_;
+
   DISALLOW_COPY_AND_ASSIGN(InputMethodBase);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_IME_INPUT_METHOD_BASE_H_