Quickly close tabs/window with long-running unload handlers.

content/browser/web_contents/web_contents_impl.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.
 
 #ifndef CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 237 matching lines @@
 
   virtual const std::string& GetContentsMimeType() const OVERRIDE;
   virtual bool WillNotifyDisconnection() const OVERRIDE;
   virtual void SetOverrideEncoding(const std::string& encoding) OVERRIDE;
   virtual void ResetOverrideEncoding() OVERRIDE;
   virtual content::RendererPreferences* GetMutableRendererPrefs() OVERRIDE;
   virtual void SetNewTabStartTime(const base::TimeTicks& time) OVERRIDE;
   virtual base::TimeTicks GetNewTabStartTime() const OVERRIDE;
   virtual void Close() OVERRIDE;
   virtual void OnCloseStarted() OVERRIDE;
+  virtual void OnUnloadDetachedStarted() OVERRIDE;
   virtual bool ShouldAcceptDragAndDrop() const OVERRIDE;
   virtual void SystemDragEnded() OVERRIDE;
   virtual void UserGestureDone() OVERRIDE;
   virtual void SetClosedByUserGesture(bool value) OVERRIDE;
   virtual bool GetClosedByUserGesture() const OVERRIDE;
   virtual double GetZoomLevel() const OVERRIDE;
   virtual int GetZoomPercent(bool* enable_increment,
                              bool* enable_decrement) const OVERRIDE;
   virtual void ViewSource() OVERRIDE;
   virtual void ViewFrameSource(const GURL& url,
@@ skipping 559 matching lines @@
 
   // The time that we started to create the new tab page.
   base::TimeTicks new_tab_start_time_;
 
   // The time that we started to close this WebContents.
   base::TimeTicks close_start_time_;
 
   // The time when onbeforeunload ended.
   base::TimeTicks before_unload_end_time_;
 
+  // The time when the tab was removed from view during close.
+  base::TimeTicks unload_detached_start_time_;
+
   // The time that this tab was last selected.
   base::TimeTicks last_selected_time_;
 
   // See description above setter.
   bool closed_by_user_gesture_;
 
   // Minimum/maximum zoom percent.
   int minimum_zoom_percent_;
   int maximum_zoom_percent_;
   // If true, the default zoom limits have been overriden for this tab, in which
@@ skipping 27 matching lines @@
   content::RenderViewHost* message_source_;
 
   // All live RenderWidgetHostImpls that are created by this object and may
   // outlive it.
   std::set<content::RenderWidgetHostImpl*> created_widgets_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsImpl);
 };
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_