Add error description to the DidFailProvisionalLoad callback.

content/public/renderer/content_renderer_client.h

Index: content/public/renderer/content_renderer_client.h
diff --git a/content/public/renderer/content_renderer_client.h b/content/public/renderer/content_renderer_client.h
index 3ed428b355021854c81604172f4364e2a6a33293..e09f9ce1ee4387dfc368128f979102d29c31b68b 100644
--- a/content/public/renderer/content_renderer_client.h
+++ b/content/public/renderer/content_renderer_client.h
@@ -67,10 +67,16 @@ class ContentRendererClient {
                              WebKit::WebFrame* frame,
                              int http_status_code) = 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 will 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 will be set to contain a brief
+  // message describing the error that has occurred.
+  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.