Add a chrome://interstitials page.

chrome/browser/ssl/ssl_blocking_page.h

 // Copyright (c) 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_SSL_SSL_BLOCKING_PAGE_H_
 #define CHROME_BROWSER_SSL_SSL_BLOCKING_PAGE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 31 matching lines @@
     CMD_DONT_PROCEED = 0,
     CMD_PROCEED = 1,
     CMD_MORE = 2,
     CMD_RELOAD = 3,
     CMD_HELP = 4,
     CMD_CLOCK = 5
   };
 
   SSLBlockingPage(
       content::WebContents* web_contents,
+      bool create_interstitial,
       int cert_error,
       const net::SSLInfo& ssl_info,
       const GURL& request_url,
       bool overridable,
       bool strict_enforcement,
       const base::Callback<void(bool)>& callback);
   virtual ~SSLBlockingPage();
 
   // A method that sets strings in the specified dictionary from the passed
   // vector so that they can be used to resource the ssl_roadblock.html/
@@ skipping 61 matching lines @@
 
   // For the FieldTrial: this contains the name of the condition.
   std::string trial_condition_;
 
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(SSLBlockingPage);
 };
 
 #endif  // CHROME_BROWSER_SSL_SSL_BLOCKING_PAGE_H_