Send an webNavigation.onErrorOccurred when a load fails after the initial navigation was committed

chrome/browser/extensions/api/web_navigation/web_navigation_api.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.
 
 // Defines the Chrome Extensions WebNavigation API functions for observing and
 // intercepting navigation events, as specified in the extension JSON API.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_API_WEB_NAVIGATION_WEB_NAVIGATION_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_WEB_NAVIGATION_WEB_NAVIGATION_API_H_
 
@@ skipping 152 matching lines @@
       int64 frame_id,
       bool is_main_frame,
       const GURL& validated_url,
       int error_code,
       const string16& error_description,
       content::RenderViewHost* render_view_host) OVERRIDE;
   virtual void DocumentLoadedInFrame(int64 frame_id) OVERRIDE;
   virtual void DidFinishLoad(int64 frame_id,
                              const GURL& validated_url,
                              bool is_main_frame) OVERRIDE;
+  virtual void DidFailLoad(int64 frame_id,
+                           const GURL& validated_url,
+                           bool is_main_frame,
+                           int error_code,
+                           const string16& error_description) OVERRIDE;
   virtual void DidOpenRequestedURL(content::WebContents* new_contents,
                                    const GURL& url,
                                    const content::Referrer& referrer,
                                    WindowOpenDisposition disposition,
                                    content::PageTransition transition,
                                    int64 source_frame_id) OVERRIDE;
   virtual void WebContentsDestroyed(content::WebContents* tab) OVERRIDE;
 
  private:
   // True if the transition and target url correspond to a reference fragment
@@ skipping 91 matching lines @@
 // API function that returns the states of all frames in a given tab.
 class GetAllFramesFunction : public SyncExtensionFunction {
   virtual ~GetAllFramesFunction() {}
   virtual bool RunImpl() OVERRIDE;
   DECLARE_EXTENSION_FUNCTION_NAME("webNavigation.getAllFrames")
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_WEB_NAVIGATION_WEB_NAVIGATION_API_H_