dom-ui sync: Eliminate jank when customizing sync settings.

chrome/browser/ui/webui/options/sync_setup_handler.h

 // Copyright (c) 2011 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_UI_WEBUI_OPTIONS_SYNC_SETUP_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_OPTIONS_SYNC_SETUP_HANDLER_H_
 
 #include "chrome/browser/sync/sync_setup_flow_handler.h"
 #include "chrome/browser/ui/webui/options/options_ui.h"
 
@@ skipping 16 matching lines @@
   virtual void ShowGaiaSuccessAndSettingUp();
   virtual void ShowConfigure(const DictionaryValue& args);
   virtual void ShowPassphraseEntry(const DictionaryValue& args);
   virtual void ShowSettingUp();
   virtual void ShowSetupDone(const std::wstring& user);
 
   virtual void SetFlow(SyncSetupFlow* flow);
 
  private:
   // Callbacks from the page.
-  void OnDidShowPage(const ListValue* args);
   void OnDidClosePage(const ListValue* args);
   void HandleSubmitAuth(const ListValue* args);
   void HandleConfigure(const ListValue* args);
   void HandlePassphraseEntry(const ListValue* args);
   void HandlePassphraseCancel(const ListValue* args);
+  void HandleAttachHandler(const ListValue* args);
 
   // Weak reference.
   SyncSetupFlow* flow_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncSetupHandler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_OPTIONS_SYNC_SETUP_HANDLER_H_