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 353 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;
 
+  // Notification that tab closing was cancelled. This can happen when a user
+  // cancels a window close via another tab's beforeunload dialog.
+  virtual void OnCloseCanceled() = 0;
+
+  // Set the time during close when unload is started. Normally, this is set
+  // after the beforeunload dialog. However, for a window close, it is set
+  // after all the beforeunload dialogs have finished.
+  virtual void OnUnloadStarted() = 0;
+
+  // Set the time during close when the tab is no longer visible.
+  virtual void OnUnloadDetachedStarted() = 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.
   virtual void UserGestureDone() = 0;
 
   // Indicates if this tab was explicitly closed by the user (control-w, close
@@ skipping 66 matching lines @@
 
  private:
   // This interface should only be implemented inside content.
   friend class WebContentsImpl;
   WebContents() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_H_