[Mac] Implement the system dictionary popup by implementing NSTextInput methods.

chrome/browser/renderer_host/render_widget_host_view.h

 // Copyright (c) 2010 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 CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_H_
 #define CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_H_
 #pragma once
 
 #if defined(OS_MACOSX)
 #include <OpenGL/OpenGL.h>
@@ skipping 154 matching lines @@
   virtual void WillDestroyRenderWidget(RenderWidgetHost* rwh) = 0;
 
   // Tells the View to destroy itself.
   virtual void Destroy() = 0;
 
   // Tells the View that the tooltip text for the current mouse position over
   // the page has changed.
   virtual void SetTooltipText(const std::wstring& tooltip_text) = 0;
 
   // Notifies the View that the renderer text selection has changed.
-  virtual void SelectionChanged(const std::string& text) {}
+  virtual void SelectionChanged(const std::string& text, int start, int end) {}
 
   // Tells the View whether the context menu is showing. This is used on Linux
   // to suppress updates to webkit focus for the duration of the show.
   virtual void ShowingContextMenu(bool showing) {}
 
   // Allocate a backing store for this view
   virtual BackingStore* AllocBackingStore(const gfx::Size& size) = 0;
 
 #if defined(OS_MACOSX)
   // Tells the view whether or not to accept first responder status.  If |flag|
@@ skipping 123 matching lines @@
 
   // The current reserved area in view coordinates where contents should not be
   // rendered to draw the resize corner, sidebar mini tabs etc.
   gfx::Rect reserved_rect_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostView);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_H_