Multi-tab: Adding new Notification when tab selection changes (again).

chrome/browser/tabs/tab_strip_model_observer.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_observer.h"
 
 void TabStripModelObserver::TabInsertedAt(TabContentsWrapper* contents,
                                           int index,
                                           bool foreground) {
 }
 
 void TabStripModelObserver::TabClosingAt(TabStripModel* tab_strip_model,
                                          TabContentsWrapper* contents,
                                          int index) {
 }
 
 void TabStripModelObserver::TabDetachedAt(TabContentsWrapper* contents,
                                           int index) {
 }
 
 void TabStripModelObserver::TabDeactivated(TabContentsWrapper* contents) {
 }
 
 void TabStripModelObserver::ActiveTabChanged(TabContentsWrapper* old_contents,
                                              TabContentsWrapper* new_contents,
                                              int index,
                                              bool user_gesture) {
 }
 
+void TabStripModelObserver::TabSelectionChanged(
+    const TabStripSelectionModel& model) {
+}
+
 void TabStripModelObserver::TabMoved(TabContentsWrapper* contents,
                                      int from_index,
                                      int to_index) {
 }
 
 void TabStripModelObserver::TabChangedAt(TabContentsWrapper* contents,
                                          int index,
                                          TabChangeType change_type) {
 }
 
@@ skipping 13 matching lines @@
 
 void TabStripModelObserver::TabBlockedStateChanged(TabContentsWrapper* contents,
                                                    int index) {
 }
 
 void TabStripModelObserver::TabStripEmpty() {}
 
 void TabStripModelObserver::TabStripModelDeleted() {}
 
 void TabStripModelObserver::ActiveTabClicked(int index) {}