Make it possible to hide "most visited" on nnnnnnntp

chrome/browser/dom_ui/shown_sections_handler.h

 // Copyright (c) 2010 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_DOM_UI_SHOWN_SECTIONS_HANDLER_H_
 #define CHROME_BROWSER_DOM_UI_SHOWN_SECTIONS_HANDLER_H_
 #pragma once
 
 #include "chrome/browser/dom_ui/dom_ui.h"
 #include "chrome/common/notification_observer.h"
 #include "chrome/browser/prefs/pref_change_registrar.h"
 
 class DOMUI;
 class Value;
 class PrefService;
 
 // Use for the shown sections bitmask.
 // Currently, only the THUMB and APPS sections can be toggled by the user. Other
 // sections are shown automatically if they have data, and hidden otherwise.
 enum Section {
-  THUMB = 1,
-  APPS = 64
+  // If one of these is set, the corresponding section shows large thumbnails,
+  // else it shows only a small overview list.
+  THUMB = 1 << 0,
+  APPS = 1 << 6,
+
+  // If one of these is set, then the corresponding section is shown minimized
+  // at the bottom of the NTP and no data is directly visible on the NTP.
+  MINIMIZED_THUMB = 1 << (0 + 16),
+  MINIMIZED_RECENT = 1 << (2 + 16),
+  MINIMIZED_APPS = 1 << (6 + 16),
 };
 
 class ShownSectionsHandler : public DOMMessageHandler,
                              public NotificationObserver {
  public:
   explicit ShownSectionsHandler(PrefService* pref_service);
   virtual ~ShownSectionsHandler() {}
 
   // Helper to get the current shown sections.
   static int GetShownSections(PrefService* pref_service);
@@ skipping 19 matching lines @@
                                int new_pref_version);
 
  private:
   PrefService* pref_service_;
   PrefChangeRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(ShownSectionsHandler);
 };
 
 #endif  // CHROME_BROWSER_DOM_UI_SHOWN_SECTIONS_HANDLER_H_