[NTP] Allow reordering of apps via drag and drop.

chrome/browser/dom_ui/app_launcher_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_APP_LAUNCHER_HANDLER_H_
 #define CHROME_BROWSER_DOM_UI_APP_LAUNCHER_HANDLER_H_
 #pragma once
 
 #include "base/scoped_ptr.h"
 #include "chrome/browser/dom_ui/dom_ui.h"
@@ skipping 53 matching lines @@
 
   // Callback for the "uninstallApp" message.
   void HandleUninstallApp(const ListValue* args);
 
   // Callback for the "hideAppPromo" message.
   void HandleHideAppsPromo(const ListValue* args);
 
   // Callback for the "createAppShortcut" message.
   void HandleCreateAppShortcut(const ListValue* args);
 
+  // Callback for the 'reorderApps" message.
+  void HandleReorderApps(const ListValue* args);
+
  private:
   // Records a web store launch in the appropriate histograms. |promo_active|
   // specifies if the web store promotion was active.
   static void RecordWebStoreLaunch(bool promo_active);
 
   // Records an app launch in the appropriate histograms. |promo_active|
   // specifies if the web store promotion was active.
   static void RecordAppLaunch(bool promo_active);
 
   // ExtensionInstallUI::Delegate implementation, used for receiving
@@ skipping 32 matching lines @@
   bool promo_active_;
 
   // When true, we ignore changes to the underlying data rather than immediately
   // refreshing. This is useful when making many batch updates to avoid flicker.
   bool ignore_changes_;
 
   DISALLOW_COPY_AND_ASSIGN(AppLauncherHandler);
 };
 
 #endif  // CHROME_BROWSER_DOM_UI_APP_LAUNCHER_HANDLER_H_