Unbreak tabs.onRemove extension API in face of fast tab closure

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 365 matching lines @@
 
   // 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;
 
+  // Called just before making the tab invisible on close.
+  virtual void OnUnloadAboutToDetach() = 0;
+
   // Set the time during close when the tab is no longer visible.
   virtual void OnUnloadDetachedStarted() = 0;

[Avi (use Gerrit), 2013/06/18 15:04:13]

:( :(

 
   // 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
   // tab menu item...). This is false for actions that indirectly close the tab,
   // such as closing the window.  The setter is maintained by TabStripModel, and
   // the getter only useful from within TAB_CLOSED notification
   virtual void SetClosedByUserGesture(bool value) = 0;
   virtual bool GetClosedByUserGesture() const = 0;
 
+  // True if view is in the process of being detached from it's containing tab
+  // as part of tab closure.
+  virtual bool GetWebContentsDetachedToClose() const = 0;
+
   // Gets the zoom level for this tab.
   virtual double GetZoomLevel() const = 0;
 
   // Gets the zoom percent for this tab.
   virtual int GetZoomPercent(bool* enable_increment,
                              bool* enable_decrement) const = 0;
 
   // Opens view-source tab for this contents.
   virtual void ViewSource() = 0;
 
@@ skipping 50 matching lines @@
 
  private:
   // This interface should only be implemented inside content.
   friend class WebContentsImpl;
   WebContents() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_H_