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

chrome/browser/renderer_host/render_view_host.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_VIEW_HOST_H_
 #define CHROME_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 589 matching lines @@
                                  int automation_id);
   void OnMsgDOMUISend(const GURL& source_url,
                       const std::string& message,
                       const std::string& content);
   void OnMsgForwardMessageToExternalHost(const std::string& message,
                                          const std::string& origin,
                                          const std::string& target);
   void OnMsgGoToEntryAtOffset(int offset);
   void OnMsgSetTooltipText(const std::wstring& tooltip_text,
                            WebKit::WebTextDirection text_direction_hint);
-  void OnMsgSelectionChanged(const std::string& text);
+  void OnMsgSelectionChanged(const std::string& text, int start, int end);
   void OnMsgPasteFromSelectionClipboard();
   void OnMsgRunFileChooser(const ViewHostMsg_RunFileChooser_Params& params);
   void OnMsgRunJavaScriptMessage(const std::wstring& message,
                                  const std::wstring& default_prompt,
                                  const GURL& frame_url,
                                  const int flags,
                                  IPC::Message* reply_msg);
   void OnMsgRunBeforeUnloadConfirm(const GURL& frame_url,
                                    const std::wstring& message,
                                    IPC::Message* reply_msg);
@@ skipping 167 matching lines @@
   // The most recently received accessibility tree - for unit testing only.
   webkit_glue::WebAccessibility accessibility_tree_;
 
   // The termination status of the last render view that terminated.
   base::TerminationStatus render_view_termination_status_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderViewHost);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_H_