Add error description to the DidFailProvisionalLoad callback.

content/public/renderer/content_renderer_client.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 CONTENT_PUBLIC_RENDERER_CONTENT_RENDERER_CLIENT_H_
 #define CONTENT_PUBLIC_RENDERER_CONTENT_RENDERER_CLIENT_H_
 #pragma once
 
 #include <string>
 
@@ skipping 52 matching lines @@
       const WebKit::WebPluginParams& params,
       WebKit::WebPlugin** plugin) = 0;
 
   // Returns true if the embedder has an error page to show for the given http
   // status code. If so |error_domain| should be set to according to WebURLError
   // and the embedder's GetNavigationErrorHtml will be called afterwards to get
   // the error html.
   virtual bool HasErrorPage(int http_status_code,
                             std::string* error_domain) = 0;
 
-  // Returns the html to display when a navigation error occurs.
-  virtual std::string GetNavigationErrorHtml(
+  // Returns the information to display when a navigation error occurs.
+  // If |error_html| is not null then it may be set to a HTML page containing
+  // the details of the error and maybe links to more info.
+  // If |error_description| is not null it may be set to contain a brief
+  // message describing the error that has occurred.
+  // Either of the out parameters may be not written to in certain cases
+  // (lack of information on the error code) so the caller should take care to
+  // initialize the string values with safe defaults before the call.
+  virtual void GetNavigationErrorStrings(
       const WebKit::WebURLRequest& failed_request,
-      const WebKit::WebURLError& error) = 0;
+      const WebKit::WebURLError& error,
+      std::string* error_html,
+      string16* error_description) = 0;
 
   // Returns true if the renderer process should schedule the idle handler when
   // all widgets are hidden.
   virtual bool RunIdleHandlerWhenWidgetsHidden() = 0;
 
   // Returns true if the given url can create popup windows.
   virtual bool AllowPopup(const GURL& creator) = 0;
 
   // Returns true if we should fork a new process for the given navigation.
   virtual bool ShouldFork(WebKit::WebFrame* frame,
@@ skipping 44 matching lines @@
                                       const std::string& value) = 0;
 
   // True if the protocol implemented to serve |url| supports features required
   // by the media engine.
   virtual bool IsProtocolSupportedForMedia(const GURL& url) = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_RENDERER_CONTENT_RENDERER_CLIENT_H_