Add the onBeforeNavigate and onErrorOccured events to the webNavigation API.

chrome/browser/extensions/extension_webnavigation_api.h

 // Copyright (c) 2010 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
 // chrome/common/extensions/api/extension_api.json.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_WEBNAVIGATION_API_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_WEBNAVIGATION_API_H_
 #pragma once
 
 #include "base/singleton.h"
 #include "chrome/browser/extensions/extension_function.h"
-#include "chrome/browser/tab_contents/navigation_controller.h"
+#include "chrome/common/notification_observer.h"
 #include "chrome/common/notification_registrar.h"
 #include "googleurl/src/gurl.h"
 
+class NavigationController;
+class ProvisionalLoadDetails;
+
 // Observes navigation notifications and routes them as events to the extension
 // system.
 class ExtensionWebNavigationEventRouter : public NotificationObserver {
  public:
   // Single instance of the event router.
   static ExtensionWebNavigationEventRouter* GetInstance();
 
   void Init();
 
  private:
   friend struct DefaultSingletonTraits<ExtensionWebNavigationEventRouter>;
 
   ExtensionWebNavigationEventRouter() {}
   virtual ~ExtensionWebNavigationEventRouter() {}
 
   // NotificationObserver implementation.
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
                        const NotificationDetails& details);
 
-  // Handler for the NAV_ENTRY_COMMITTED event. The method takes the details of
-  // such an event and constructs a suitable JSON formatted extension event
-  // from it.
-  void NavEntryCommitted(NavigationController* controller,
-                         NavigationController::LoadCommittedDetails* details);
+  // Handler for the FRAME_PROVISIONAL_LOAD_START event. The method takes the
+  // details of such an event and constructs a suitable JSON formatted extension
+  // event from it.
+  void FrameProvisionalLoadStart(NavigationController* controller,
+                                 ProvisionalLoadDetails* details);
+
+  // Handler for the FRAME_PROVISIONAL_LOAD_COMMITTED event. The method takes
+  // the details of such an event and constructs a suitable JSON formatted
+  // extension event from it.
+  void FrameProvisionalLoadCommitted(NavigationController* controller,
+                                     ProvisionalLoadDetails* details);
+
+  // Handler for the FAIL_PROVISIONAL_LOAD_WITH_ERROR event. The method takes
+  // the details of such an event and constructs a suitable JSON formatted
+  // extension event from it.
+  void FailProvisionalLoadWithError(NavigationController* controller,
+                                    ProvisionalLoadDetails* details);
 
   // This method dispatches events to the extension message service.
   void DispatchEvent(Profile* context,
                      const char* event_name,
                      const std::string& json_args);
 
   // Used for tracking registrations to navigation notifications.
   NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionWebNavigationEventRouter);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_WEBNAVIGATION_API_H_