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

ui/views/controls/textfield/native_textfield_views.h

 // Copyright (c) 2013 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_CONTROLS_TEXTFIELD_NATIVE_TEXTFIELD_VIEWS_H_
 #define UI_VIEWS_CONTROLS_TEXTFIELD_NATIVE_TEXTFIELD_VIEWS_H_
 
 #include "base/memory/weak_ptr.h"
 #include "base/strings/string16.h"
 #include "base/timer/timer.h"
@@ skipping 180 matching lines @@
   virtual bool GetSelectionRange(gfx::Range* range) const OVERRIDE;
   virtual bool SetSelectionRange(const gfx::Range& range) OVERRIDE;
   virtual bool DeleteRange(const gfx::Range& range) OVERRIDE;
   virtual bool GetTextFromRange(const gfx::Range& range,
                                 string16* text) const OVERRIDE;
   virtual void OnInputMethodChanged() OVERRIDE;
   virtual bool ChangeTextDirectionAndLayoutAlignment(
       base::i18n::TextDirection direction) OVERRIDE;
   virtual void ExtendSelectionAndDelete(size_t before, size_t after) OVERRIDE;
   virtual void EnsureCaretInRect(const gfx::Rect& rect) OVERRIDE;
+  virtual void OnCandidateWindowShow() OVERRIDE {}
+  virtual void OnCandidateWindowUpdate() OVERRIDE {}
+  virtual void OnCandidateWindowHide() OVERRIDE {}
 
   // Overridden from TextfieldViewsModel::Delegate:
   virtual void OnCompositionTextConfirmedOrCleared() OVERRIDE;
 
   // Returns the TextfieldViewsModel's text/cursor/selection rendering model.
   gfx::RenderText* GetRenderText() const;
 
   // Converts |text| according to textfield style, e.g. lower case if
   // |textfield_| has STYLE_LOWERCASE style.
   string16 GetTextForDisplay(const string16& text);
@@ skipping 122 matching lines @@
   // obscured text. When the timer is running, the last typed char is shown
   // and when the time expires, the last typed char is obscured.
   base::OneShotTimer<NativeTextfieldViews> obscured_reveal_timer_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeTextfieldViews);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_TEXTFIELD_NATIVE_TEXTFIELD_VIEWS_H_