Take 2 at implementing activeTab.

chrome/browser/extensions/extension_tab_util.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_tab_util.h"
 
 #include "chrome/browser/extensions/api/tabs/tabs_constants.h"
+#include "chrome/browser/extensions/extension_tab_helper.h"
 #include "chrome/browser/net/url_fixer_upper.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/sessions/restore_tab_helper.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_list.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/tab_contents/tab_contents.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/extension_manifest_constants.h"
@@ skipping 16 matching lines @@
 int ExtensionTabUtil::GetWindowIdOfTabStripModel(
     const TabStripModel* tab_strip_model) {
   for (BrowserList::const_iterator it = BrowserList::begin();
        it != BrowserList::end(); ++it) {
     if ((*it)->tab_strip_model() == tab_strip_model)
       return GetWindowId(*it);
   }
   return -1;
 }
 
-// TODO(sky): this function should really take a TabContents.
 int ExtensionTabUtil::GetTabId(const WebContents* web_contents) {
   const TabContents* tab = TabContents::FromWebContents(web_contents);
-  return tab ? tab->restore_tab_helper()->session_id().id() : -1;
+  return tab ? tab->extension_tab_helper()->tab_id() : -1;
 }
 
 std::string ExtensionTabUtil::GetTabStatusText(bool is_loading) {
   return is_loading ? keys::kStatusValueLoading : keys::kStatusValueComplete;
 }
 
-// TODO(sky): this function should really take a TabContents.
 int ExtensionTabUtil::GetWindowIdOfTab(const WebContents* web_contents) {
   const TabContents* tab = TabContents::FromWebContents(web_contents);
-  return tab ? tab->restore_tab_helper()->window_id().id() : -1;
+  return tab ? tab->extension_tab_helper()->window_id() : -1;
 }
 
 DictionaryValue* ExtensionTabUtil::CreateTabValue(const WebContents* contents) {
   // Find the tab strip and index of this guy.
   TabStripModel* tab_strip = NULL;
   int tab_index;
   if (ExtensionTabUtil::GetTabStripModel(contents, &tab_strip, &tab_index))
     return ExtensionTabUtil::CreateTabValue(contents, tab_strip, tab_index);
 
   // Couldn't find it.  This can happen if the tab is being dragged.
@@ skipping 145 matching lines @@
 }
 
 bool ExtensionTabUtil::IsCrashURL(const GURL& url) {
   // Check a fixed-up URL, to normalize the scheme and parse hosts correctly.
   GURL fixed_url =
       URLFixerUpper::FixupURL(url.possibly_invalid_spec(), std::string());
   return (fixed_url.SchemeIs(chrome::kChromeUIScheme) &&
           (fixed_url.host() == chrome::kChromeUIBrowserCrashHost ||
            fixed_url.host() == chrome::kChromeUICrashHost));
 }