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

content/public/browser/web_contents.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_PUBLIC_BROWSER_WEB_CONTENTS_H_
 #define CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_H_
 
 #include "base/basictypes.h"
 #include "base/callback_forward.h"
 #include "base/process_util.h"
@@ skipping 292 matching lines @@
   virtual base::TimeTicks GetNewTabStartTime() const = 0;
 
   // Tells the tab to close now. The tab will take care not to close until it's
   // out of nested message loops.
   virtual void Close() = 0;
 
   // Notification that tab closing has started.  This can be called multiple
   // times, subsequent calls are ignored.
   virtual void OnCloseStarted() = 0;
 
+  // Set the time during close when the tab is no longer visible.
+  virtual void OnUnloadDetachedStarted() = 0;
+
   // Returns true if underlying WebContentsView should accept drag-n-drop.
   virtual bool ShouldAcceptDragAndDrop() const = 0;
 
   // A render view-originated drag has ended. Informs the render view host and
   // WebContentsDelegate.
   virtual void SystemDragEnded() = 0;
 
   // Notification the user has made a gesture while focus was on the
   // page. This is used to avoid uninitiated user downloads (aka carpet
   // bombing), see DownloadRequestLimiter for details.
@@ skipping 56 matching lines @@
   // Focuses the location bar.
   virtual void SetFocusToLocationBar(bool select_all) = 0;
 
   // Does this have an opener associated with it?
   virtual bool HasOpener() const = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_H_