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diff --git a/chrome/browser/extensions/apps_promo.h b/chrome/browser/extensions/apps_promo.h
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+// 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_EXTENSIONS_APPS_PROMO_H_
+#define CHROME_BROWSER_EXTENSIONS_APPS_PROMO_H_
+#pragma once
+
+#include <set>
+#include <string>
+
+#include "base/gtest_prod_util.h"
+#include "chrome/common/extensions/extension.h"
+
+class PrefService;
+
+// This encapsulates business logic for:
+// - Whether to show the apps promo in the launcher
+// - Whether to expire existing default apps
+class AppsPromo {
+ public:
+  // Register our preferences. Parts of the promo content are stored in Local
+  // State since they're independent of the user profile.
+  static void RegisterPrefs(PrefService* local_state);
+  static void RegisterUserPrefs(PrefService* prefs);
+
+  // Removes the current promo data.
+  static void ClearPromo();
+
+  // Gets the ID of the current promo.
+  static std::string GetPromoId();
+
+  // Gets the text for the promo button.
+  static std::string GetPromoButtonText();
+
+  // Gets the text for the promo header.
+  static std::string GetPromoHeaderText();
+
+  // Gets the promo link.
+  static GURL GetPromoLink();
+
+  // Gets the text for the promo "hide this" link.
+  static std::string GetPromoExpireText();
+
+  // Called to set the current promo data.
+  static void SetPromo(const std::string& id,
+                       const std::string& header_text,
+                       const std::string& button_text,
+                       const GURL& link,
+                       const std::string& expire_text);
+
+  explicit AppsPromo(PrefService* prefs);
+  ~AppsPromo();
+
+  // Gets the set of old default apps that may have been installed by previous
+  // versions of Chrome.
+  const ExtensionIdSet& old_default_apps() const {
+    return old_default_app_ids_;
+  }
+
+  // Halts the special treatment of the default apps. The default apps may be
+  // removed by the caller after calling this method. If the apps remain
+  // installed, AppsPromo will no longer consider the apps "default".
+  void ExpireDefaultApps();
+
+  // Called to hide the promo from the apps section.
+  void HidePromo();
+
+  // Maximizes the apps section the first time this is called for a given promo.
+  void MaximizeAppsIfFirstView();
+
+  // Returns true if the app launcher should be displayed on the NTP.
+  bool ShouldShowAppLauncher(const ExtensionIdSet& installed_ids);
+
+  // Returns true if the apps promo should be displayed in the launcher.
+  bool ShouldShowPromo(const ExtensionIdSet& installed_ids,
+                       bool* just_expired);
+
+ private:
+  FRIEND_TEST_ALL_PREFIXES(ExtensionAppsPromo, HappyPath);
+  FRIEND_TEST_ALL_PREFIXES(ExtensionAppsPromo, PromoPrefs);
+  FRIEND_TEST_ALL_PREFIXES(ExtensionAppsPromo, UpdatePromoFocus);
+
+  // The maximum number of times to show the apps promo. The promo counter
+  // actually goes up to this number + 1 because we need to differentiate
+  // between the first time we overflow and subsequent times.
+  static const int kDefaultAppsCounterMax;
+
+  // Returns true if a promo is available for the current locale.
+  static bool IsPromoSupportedForLocale();
+
+  bool GetDefaultAppsInstalled() const;
+
+  // Gets/sets the ID of the last promo shown.
+  std::string GetLastPromoId();
+  void SetLastPromoId(const std::string& id);
+
+  // Gets/sets the number of times the promo has been viewed. Promo views are
+  // only counted when the default apps are installed.
+  int GetPromoCounter() const;
+  void SetPromoCounter(int val);
+
+  // Our permanent state is stored in this PrefService instance.
+  PrefService* prefs_;
+
+  // The set of default extensions. Initialized to a static list in the
+  // constructor.
+  ExtensionIdSet old_default_app_ids_;
+
+  DISALLOW_COPY_AND_ASSIGN(AppsPromo);
+};
+
+#endif  // CHROME_BROWSER_EXTENSIONS_APPS_PROMO_H_