Three way experiment for "Show saved copy" button.

components/error_page/renderer/net_error_helper_core.h

 // Copyright 2013 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 COMPONENTS_ERROR_PAGE_RENDERER_NET_ERROR_HELPER_CORE_H_
 #define COMPONENTS_ERROR_PAGE_RENDERER_NET_ERROR_HELPER_CORE_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 27 matching lines @@
   };
 
   enum PageType {
     NON_ERROR_PAGE,
     ERROR_PAGE,
   };
 
   enum Button {
     NO_BUTTON,
     RELOAD_BUTTON,
-    LOAD_STALE_BUTTON,
+    SHOW_SAVED_COPY_BUTTON,
     MORE_BUTTON,
   };
 
   // The Delegate handles all interaction with the RenderView, WebFrame, and
   // the network, as well as the generation of error pages.
   class Delegate {
    public:
     // Generates an error page's HTML for the given error.
     virtual void GenerateLocalizedErrorPage(
         const blink::WebURLError& error,
         bool is_failed_post,
         scoped_ptr<error_page::ErrorPageParams> params,
         bool* reload_button_shown,
-        bool* load_stale_button_shown,
+        bool* show_saved_copy_button_shown,
         std::string* html) const = 0;
 
     // Loads the given HTML in the main frame for use as an error page.
     virtual void LoadErrorPageInMainFrame(const std::string& html,
                                           const GURL& failed_url) = 0;
 
     // Create extra Javascript bindings in the error page.
     virtual void EnablePageHelperFunctions() = 0;
 
     // Updates the currently displayed error page with a new error code.  The
@@ skipping 192 matching lines @@
 
   // This value is set only when a navigation has been initiated from
   // the error page.  It is used to detect when such navigations result
   // in errors.
   Button navigation_from_button_;
 };
 
 }  // namespace error_page
 
 #endif  // COMPONENTS_ERROR_PAGE_RENDERER_NET_ERROR_HELPER_CORE_H_