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

content/browser/renderer_host/render_widget_host_view_win.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 CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_WIN_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_WIN_H_
 
 #include <atlbase.h>
 #include <atlapp.h>
 #include <atlcrack.h>
@@ skipping 274 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 {}
 
  protected:
   friend class RenderWidgetHostView;
 
   // Should construct only via RenderWidgetHostView::CreateViewForWidget.
   //
   // The view will associate itself with the given widget.
   explicit RenderWidgetHostViewWin(RenderWidgetHost* widget);
 
   // Windows Message Handlers
@@ skipping 299 matching lines @@
   base::win::ScopedComPtr<IAccessible> window_iaccessible_;
 
   ui::LatencyInfo software_latency_info_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewWin);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_WIN_H_