Add a new App launcher promo to the apps page / NTP.

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

 // Copyright (c) 2012 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_APP_LAUNCHER_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_NTP_APP_LAUNCHER_HANDLER_H_
 
 #include <set>
 #include <string>
 
@@ skipping 75 matching lines @@
   void HandleSaveAppPageName(const base::ListValue* args);
 
   // Callback for the "generateAppForLink" message.
   void HandleGenerateAppForLink(const base::ListValue* args);
 
   // Callback for the "recordAppLaunchByURL" message. Takes an escaped URL and a
   // launch source (integer), and if the URL represents an app, records the
   // action for UMA.
   void HandleRecordAppLaunchByUrl(const base::ListValue* args);
 
+  // Callback for "stopShowingAppLauncherPromo" message.
+  void StopShowingAppLauncherPromo(const base::ListValue* args);
+
   // Callback for "closeNotification" message.
   void HandleNotificationClose(const base::ListValue* args);
 
   // Callback for "setNotificationsDisabled" message.
   void HandleSetNotificationsDisabled(const base::ListValue* args);
 
   // Register app launcher preferences.
   static void RegisterUserPrefs(PrefRegistrySyncable* registry);
 
   // Records the given type of app launch for UMA.
@@ skipping 38 matching lines @@
   // needed.
   ExtensionUninstallDialog* GetExtensionUninstallDialog();
 
   // Continuation for installing a bookmark app after favicon lookup.
   void OnFaviconForApp(scoped_ptr<AppInstallInfo> install_info,
                        const history::FaviconImageResult& image_result);
 
   // Sends |highlight_app_id_| to the js.
   void SetAppToBeHighlighted();
 
-  void OnPreferenceChanged();
+  void OnExtensionPreferenceChanged();
+
+  void OnLocalStatePreferenceChanged();
 
   // The apps are represented in the extensions model, which
   // outlives us since it's owned by our containing profile.
   ExtensionService* const extension_service_;
 
   // We monitor changes to the extension system so that we can reload the apps
   // when necessary.
   content::NotificationRegistrar registrar_;
 
   // Monitor extension preference changes so that the Web UI can be notified.
-  PrefChangeRegistrar pref_change_registrar_;
+  PrefChangeRegistrar extension_pref_change_registrar_;
+
+  // Monitor the local state pref to control the app launcher promo.
+  PrefChangeRegistrar local_state_pref_change_registrar_;
 
   // Used to show confirmation UI for uninstalling extensions in incognito mode.
   scoped_ptr<ExtensionUninstallDialog> extension_uninstall_dialog_;
 
   // Used to show confirmation UI for enabling extensions.
   scoped_ptr<ExtensionEnableFlow> extension_enable_flow_;
 
   // The ids of apps to show on the NTP.
   std::set<std::string> visible_apps_;
 
@@ skipping 17 matching lines @@
   // when the app is added to the page (via getAppsCallback or appAdded).
   std::string highlight_app_id_;
 
   // Used for favicon loading tasks.
   CancelableTaskTracker cancelable_task_tracker_;
 
   DISALLOW_COPY_AND_ASSIGN(AppLauncherHandler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_NTP_APP_LAUNCHER_HANDLER_H_