Helper functions for tracking stale TabContentsDelegate's.

content/browser/tab_contents/tab_contents_delegate.h

 // Copyright (c) 2011 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_TAB_CONTENTS_TAB_CONTENTS_DELEGATE_H_
 #define CONTENT_BROWSER_TAB_CONTENTS_TAB_CONTENTS_DELEGATE_H_
 #pragma once
 
+#include <set>
 #include <string>
 
 #include "base/basictypes.h"
 #include "content/browser/tab_contents/navigation_entry.h"
 #include "content/common/navigation_types.h"
 #include "content/common/page_transition_types.h"
 #include "ui/gfx/native_widget_types.h"
 #include "webkit/glue/window_open_disposition.h"
 
 namespace content {
@@ skipping 15 matching lines @@
 class HtmlDialogUIDelegate;
 struct NativeWebKeyboardEvent;
 class Profile;
 class RenderViewHost;
 class TabContents;
 
 // Objects implement this interface to get notified about changes in the
 // TabContents and to provide necessary functionality.
 class TabContentsDelegate {
  public:
+  TabContentsDelegate();
+
   // When a main frame navigation occurs CreateMainFrameCommitDetails() is
   // invoked. The |MainFrameCommitDetails| returned from
   // CreateMainFrameCommitDetails() are then passed to
   // DidNavigateMainFramePostCommit. This allows the delegate to save state
   // before the commit and get that state after the commit.
   struct MainFrameCommitDetails {
     virtual ~MainFrameCommitDetails() {}
   };
 
   // Opens a new URL inside the passed in TabContents (if source is 0 open
@@ skipping 243 matching lines @@
       TabContents* tab,
       const MainFrameCommitDetails& details);
 
   // Returns a pointer to a service to create JavaScript dialogs. The default
   // pointer returned is to a stub service that marks all dialogs as suppressed
   // and displays nothing.
   virtual content::JavaScriptDialogCreator* GetJavaScriptDialogCreator();
 
  protected:
   virtual ~TabContentsDelegate();
+
+ private:
+  friend class TabContents;
+
+  // Called when |this| becomes the TabContentsDelegate for |source|.
+  void Attach(TabContents* source);
+
+  // Called when |this| is no longer the TabContentsDelegate for |source|.
+  void Detach(TabContents* source);
+
+  // The TabContents that this is currently a delegate for.
+  std::set<TabContents*> attached_contents_;
 };
 
 #endif  // CONTENT_BROWSER_TAB_CONTENTS_TAB_CONTENTS_DELEGATE_H_