Fixed behavior of the bookmark bar visibility.

chrome/browser/ui/webui/ntp/new_tab_ui.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_NTP_NEW_TAB_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_NTP_NEW_TAB_UI_H_
 #pragma once
 
 #include <string>
 
 #include "base/gtest_prod_util.h"
+#include "base/time.h"
 #include "base/timer.h"
+#include "chrome/browser/prefs/pref_change_registrar.h"
 #include "chrome/browser/sessions/tab_restore_service.h"
 #include "chrome/browser/ui/webui/chrome_url_data_manager.h"
 #include "chrome/browser/ui/webui/chrome_web_ui.h"
 #include "content/common/notification_observer.h"
 #include "content/common/notification_registrar.h"
 
 class GURL;
-class MessageLoop;
 class PrefService;
 class Profile;
 
 // The TabContents used for the New Tab page.
 class NewTabUI : public ChromeWebUI,
                  public NotificationObserver {
  public:
   explicit NewTabUI(TabContents* manager);
   virtual ~NewTabUI();
 
@@ skipping 54 matching lines @@
   // Reset the CSS caches.
   void InitializeCSSCaches();
 
   void StartTimingPaint(RenderViewHost* render_view_host);
   void PaintTimeout();
 
   // Updates the user prefs version and calls |MigrateUserPrefs| if needed.
   // Returns true if the version was updated.
   static bool UpdateUserPrefsVersion(PrefService* prefs);
 
+  // Overridden from ChromeWebUI. Determines if the bookmarks bar can be shown
+  // detached from the location bar.
+  virtual bool CanShowBookmarkBar() const OVERRIDE;
+
   NotificationRegistrar registrar_;
 
+  // Tracks updates of the kShowBookmarkBar preference.
+  PrefChangeRegistrar pref_change_registrar_;
   // The time when we started benchmarking.
   base::TimeTicks start_;
   // The last time we got a paint notification.
   base::TimeTicks last_paint_;
   // Scoping so we can be sure our timeouts don't outlive us.
   base::OneShotTimer<NewTabUI> timer_;
   // The preference version. This used for migrating prefs of the NTP.
   static const int current_pref_version_ = 3;
 
   DISALLOW_COPY_AND_ASSIGN(NewTabUI);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_NTP_NEW_TAB_UI_H_