Fall back to local page if online NTP fails to load.

chrome/browser/ui/search/search_tab_helper.h

 // Copyright 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 CHROME_BROWSER_UI_SEARCH_SEARCH_TAB_HELPER_H_
 #define CHROME_BROWSER_UI_SEARCH_SEARCH_TAB_HELPER_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "chrome/browser/ui/search/search_model.h"
@@ skipping 15 matching lines @@
   virtual ~SearchTabHelper();
 
   SearchModel* model() {
     return &model_;
   }
 
   // Invoked when the OmniboxEditModel changes state in some way that might
   // affect the search mode.
   void OmniboxEditModelChanged(bool user_input_in_progress, bool cancelling);
 
+  // Invoked when the tab is being redirected from the online page to the
+  // local fallback page.  At this time we reset our state to prepare for the
+  // new loading events.
+  void RedirectingToLocal();
+
   // Invoked when the active navigation entry is updated in some way that might
   // affect the search mode. This is used by Instant when it "fixes up" the
   // virtual URL of the active entry. Regular navigations are captured through
   // the notification system and shouldn't call this method.
   void NavigationEntryUpdated();
 
  private:
   friend class content::WebContentsUserData<SearchTabHelper>;
 
   explicit SearchTabHelper(content::WebContents* web_contents);
@@ skipping 23 matching lines @@
   SearchModel model_;
 
   content::NotificationRegistrar registrar_;
 
   content::WebContents* web_contents_;
 
   DISALLOW_COPY_AND_ASSIGN(SearchTabHelper);
 };
 
 #endif  // CHROME_BROWSER_UI_SEARCH_SEARCH_TAB_HELPER_H_