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diff --git a/chrome/browser/extensions/default_apps.h b/chrome/browser/extensions/default_apps.h
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+// 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_EXTENSIONS_DEFAULT_APPS_H_
+#define CHROME_BROWSER_EXTENSIONS_DEFAULT_APPS_H_
+#pragma once
+
+#include <set>
+#include <string>
+#include "chrome/common/extensions/extension.h"
+#include "base/gtest_prod_util.h"
+
+class PrefService;
+
+// Manages the installation of the set of default apps into Chrome, and the
+// promotion of those apps in the launcher.
+//
+// It implements the following rules:
+//
+// - Only install default apps once per-profile.
+// - Don't install default apps if any apps are already installed.
+// - Do not start showing the promo until all default apps have been installed.
+// - Do not show the promo if it has been hidden by the user.
+// - Do not show promo after one app has been manually installed or uninstalled.
+// - Do not show promo if the set of installed apps is different than the set of
+//   default apps.
+// - Only show promo a certain amount of times.
+//
+// The promo can also be forced on with --force-apps-promo-visible.
+class DefaultApps {
+ public:
+  // The maximum number of times to show the apps promo.
+  static const int kAppsPromoCounterMax;
+
+  // Register our preferences.
+  static void RegisterUserPrefs(PrefService* prefs);
+
+  explicit DefaultApps(PrefService* prefs);
+
+  // Gets the list of default apps that should be installed. Can return NULL if
+  // no apps need to be installed.
+  const ExtensionIdSet* GetAppsToInstall() const;
+
+  // Should be called after each app is installed. Once installed_ids contains
+  // all the default apps, GetAppsToInstall() will start returning NULL.
+  void DidInstallApp(const ExtensionIdSet& installed_ids);
+
+  // Returns true if the apps promo should be displayed in the launcher. This
+  // starts returning true once the default apps have all been installed and
+  // stops after the promo expires.
+  bool ShouldShowPromo(const ExtensionIdSet& installed_ids);
+
+  // Should be called after each time the promo is installed.
+  void DidShowPromo();
+
+  // Force the promo to be hidden.
+  void SetPromoHidden();
+
+ private:
+  FRIEND_TEST_ALL_PREFIXES(DefaultApps, Basics);
+  FRIEND_TEST_ALL_PREFIXES(DefaultApps, HidePromo);
+  FRIEND_TEST_ALL_PREFIXES(DefaultApps, InstallingAnAppHidesPromo);
+  FRIEND_TEST_ALL_PREFIXES(DefaultApps,
+                           ManualAppInstalledWhileInstallingDefaultApps);
+
+  bool GetDefaultAppsInstalled() const;
+  void SetDefaultAppsInstalled(bool val);
+
+  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 ids_;
+
+  DISALLOW_COPY_AND_ASSIGN(DefaultApps);
+};
+
+#endif  // CHROME_BROWSER_EXTENSIONS_DEFAULT_APPS_H_