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

chrome/browser/dom_ui/app_launcher_handler.h

Index: chrome/browser/dom_ui/app_launcher_handler.h
diff --git a/chrome/browser/dom_ui/app_launcher_handler.h b/chrome/browser/dom_ui/app_launcher_handler.h
index 4940752a514b5010fdfef3c34836643384be0cf2..cee1aafb243b21ce74815af06d84118f8bab5b14 100644
--- a/chrome/browser/dom_ui/app_launcher_handler.h
+++ b/chrome/browser/dom_ui/app_launcher_handler.h
@@ -71,6 +71,9 @@ class AppLauncherHandler
   // 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.