Multi-tab: Adding new Notification when tab selection changes.

chrome/browser/tabs/tab_strip_model_order_controller.cc

 // 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.
 
 #include "chrome/browser/tabs/tab_strip_model_order_controller.h"
 
 #include "chrome/browser/ui/tab_contents/tab_contents_wrapper.h"
 
 ///////////////////////////////////////////////////////////////////////////////
 // TabStripModelOrderController, public:
@@ skipping 93 matching lines @@
     return selected_index - 1;
 
   return selected_index;
 }
 
 void TabStripModelOrderController::ActiveTabChanged(
     TabContentsWrapper* old_contents,
     TabContentsWrapper* new_contents,
     int index,
     bool user_gesture) {
-  if (old_contents == new_contents)
-    return;
-
   NavigationController* old_opener = NULL;
   if (old_contents) {
     int index = tabstrip_->GetIndexOfTabContents(old_contents);
     if (index != TabStripModel::kNoTab) {
       old_opener = tabstrip_->GetOpenerOfTabContentsAt(index);
 
       // Forget any group/opener relationships that need to be reset whenever
       // selection changes (see comment in TabStripModel::AddTabContentsAt).
       if (tabstrip_->ShouldResetGroupOnSelect(old_contents))
         tabstrip_->ForgetGroup(old_contents);
@@ skipping 10 matching lines @@
 
 ///////////////////////////////////////////////////////////////////////////////
 // TabStripModelOrderController, private:
 
 int TabStripModelOrderController::GetValidIndex(
     int index, int removing_index) const {
   if (removing_index < index)
     index = std::max(0, index - 1);
   return index;
 }