implement remaining tab events (except for onTabUpdated).

chrome/browser/extensions/extension_browser_event_router.h

 // Copyright (c) 2009 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 CHROME_BROWSER_EXTENSIONS_EXTENSION_BROWSER_EVENT_ROUTER_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_BROWSER_EVENT_ROUTER_H_
 
 #include <vector>
+#include <set>
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/singleton.h"
 #include "chrome/browser/tabs/tab_strip_model.h"
 #include "chrome/common/notification_observer.h"
 
 // The ExtensionBrowserEventRouter listens to Browser window & tab events
 // and routes them to listeners inside extension process renderers.
 // ExtensionBrowserEventRouter listens to *all* events, but will only route
@@ skipping 23 matching lines @@
   // NotificationObserver
   void Observe(NotificationType type,
                const NotificationSource& source,
                const NotificationDetails& details);
  private:
   ExtensionBrowserEventRouter();
   friend struct DefaultSingletonTraits<ExtensionBrowserEventRouter>;
 
   bool initialized_;
 
+  // Maintain set of known tab ids, so we can distinguish between tab creation
+  // and tab insertion. Also used to not send tab-detached after tab-removed.

[Matt Perry, 2009/04/22 18:20:17]

nit: "Also used to avoid sending"

+  std::set<int> tab_ids_;
+
   DISALLOW_COPY_AND_ASSIGN(ExtensionBrowserEventRouter);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_BROWSER_EVENT_ROUTER_H_