Add "SHOW ALL SAVED PAGES" button to offline error page

chrome/browser/net/net_error_tab_helper.h

Index: chrome/browser/net/net_error_tab_helper.h
diff --git a/chrome/browser/net/net_error_tab_helper.h b/chrome/browser/net/net_error_tab_helper.h
index 4e6b83ef3a5004ca0291e0a4a479bdb8f083d146..d21cce0983652434b295b55f90593ce526eea990 100644
--- a/chrome/browser/net/net_error_tab_helper.h
+++ b/chrome/browser/net/net_error_tab_helper.h
@@ -102,6 +102,10 @@ class NetErrorTabHelper
   // testing.
   virtual void RunNetworkDiagnosticsHelper(const std::string& sanitized_url);
 
+  // Relates to offline pages handling.
+  void SetHasOfflinePages(content::RenderFrameHost* render_frame_host);
+  void ShowOfflinePages();
+
   // True if the last provisional load that started was for an error page.
   bool is_error_page_;