Introduce per-tab preferences service.

content/browser/tab_contents/tab_contents.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 CONTENT_BROWSER_TAB_CONTENTS_TAB_CONTENTS_H_
 #define CONTENT_BROWSER_TAB_CONTENTS_TAB_CONTENTS_H_
 #pragma once
 
 #include <deque>
 #include <map>
@@ skipping 20 matching lines @@
 #include "net/base/load_states.h"
 #include "ui/gfx/native_widget_types.h"
 #include "webkit/glue/resource_type.h"
 
 #if defined(OS_WIN)
 #include "base/win/scoped_handle.h"
 #endif
 
 class DownloadItem;
 class LoadNotificationDetails;
+class PrefService;
 class RenderViewHost;
 class SessionStorageNamespace;
 class SiteInstance;
 class TabContentsDelegate;
 class TabContentsObserver;
 class TabContentsView;
 struct ViewHostMsg_DidFailProvisionalLoadWithError_Params;
 
 namespace webkit_glue {
 struct WebIntentData;
@@ skipping 812 matching lines @@
   // remember it.
   bool temporary_zoom_settings_;
 
   // Content restrictions, used to disable print/copy etc based on content's
   // (full-page plugins for now only) permissions.
   int content_restrictions_;
 
   // Our view type. Default is VIEW_TYPE_TAB_CONTENTS.
   content::ViewType view_type_;
 
+  // Allows overriding user preferences per tab.
+  scoped_ptr<PrefService> per_tab_prefs_;
+
   DISALLOW_COPY_AND_ASSIGN(TabContents);
 };
 
 #endif  // CONTENT_BROWSER_TAB_CONTENTS_TAB_CONTENTS_H_