Take 2 at implementing activeTab.

chrome/browser/extensions/extension_toolbar_model.cc

 // 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.
 
 #include "chrome/browser/extensions/extension_toolbar_model.h"
 
 #include "chrome/browser/extensions/extension_browser_event_router.h"
 #include "chrome/browser/extensions/extension_prefs.h"
 #include "chrome/browser/extensions/extension_service.h"
+#include "chrome/browser/extensions/extension_tab_helper.h"
 #include "chrome/browser/extensions/extension_tab_util.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/tab_contents/tab_contents.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/pref_names.h"
 #include "content/public/browser/notification_details.h"
 #include "content/public/browser/notification_source.h"
@@ skipping 68 matching lines @@
     Browser* browser,
     GURL* popup_url_out) {
   TabContents* tab_contents = browser->GetActiveTabContents();
   if (!tab_contents)
     return ACTION_NONE;
 
   int tab_id = ExtensionTabUtil::GetTabId(tab_contents->web_contents());
   if (tab_id < 0)
     return ACTION_NONE;
 
+  tab_contents->extension_tab_helper()->active_tab_permission_manager()->
+      GrantIfRequested(extension);
+
   ExtensionAction* browser_action = extension->browser_action();
   if (browser_action->HasPopup(tab_id)) {
     if (popup_url_out)
       *popup_url_out = browser_action->GetPopupUrl(tab_id);
     return ACTION_SHOW_POPUP;
   }
 
   service_->browser_event_router()->BrowserActionExecuted(
       extension->id(), browser);
   return ACTION_NONE;
@@ skipping 176 matching lines @@
   int incognito_index = 0, i = 0;
   for (ExtensionList::iterator iter = begin(); iter != end();
        ++iter, ++i) {
     if (original_index == i)
       break;
     if (service_->IsIncognitoEnabled((*iter)->id()))
       ++incognito_index;
   }
   return incognito_index;
 }