Changes to add duration into history database.

chrome/browser/history/history_tab_helper.h

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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_HISTORY_HISTORY_TAB_HELPER_H_
 #define CHROME_BROWSER_HISTORY_HISTORY_TAB_HELPER_H_
 #pragma once
 
 #include "base/memory/ref_counted.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
@@ skipping 31 matching lines @@
 
  private:
   // content::WebContentsObserver implementation.
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
   virtual void DidNavigateMainFrame(
       const content::LoadCommittedDetails& details,
       const content::FrameNavigateParams& params) OVERRIDE;
   virtual void DidNavigateAnyFrame(
       const content::LoadCommittedDetails& details,
       const content::FrameNavigateParams& params) OVERRIDE;
+  virtual void WebContentsDestroyed(content::WebContents* tab) OVERRIDE;
 
   // content::NotificationObserver implementation.
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   void OnPageContents(const GURL& url,
                       int32 page_id,
                       const string16& contents);
   void OnThumbnail(const GURL& url,
                    const ThumbnailScore& score,
                    const SkBitmap& bitmap);
 
   // Helper function to return the history service.  May return NULL.
   HistoryService* GetHistoryService();
 
   // Whether we have a (non-empty) title for the current page.
   // Used to prevent subsequent title updates from affecting history. This
   // prevents some weirdness because some AJAXy apps use titles for status
   // messages.
   bool received_page_title_;
 
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(HistoryTabHelper);
 };
 
 #endif  // CHROME_BROWSER_HISTORY_HISTORY_TAB_HELPER_H_