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

chrome/common/notification_type.h

 // 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_COMMON_NOTIFICATION_TYPE_H_
 #define CHROME_COMMON_NOTIFICATION_TYPE_H_
 #pragma once
 
 // This file describes various types used to describe and filter notifications
 // that pass through the NotificationService.
@@ skipping 1287 matching lines @@
     INSTANT_CONTROLLER_SHOWN,
 
     // Password Store ----------------------------------------------------------
     // This notification is sent whenenever login entries stored in the password
     // store are changed. The detail of this notification is a list of changes
     // represented by a vector of PasswordStoreChange. Each change includes a
     // change type (ADD, UPDATE, or REMOVE) as well as the
     // |webkit_glue::PasswordForm|s that were affected.
     LOGINS_CHANGED,
 
+    // Sent when the applications in the NTP app launcher have been reordered.
+    EXTENSION_LAUNCHER_REORDERED,
+
     // Count (must be last) ----------------------------------------------------
     // Used to determine the number of notification types.  Not valid as
     // a type parameter when registering for or posting notifications.
     NOTIFICATION_TYPE_COUNT
   };
 
   // TODO(erg): Our notification system relies on implicit conversion.
   NotificationType(Type v) : value(v) {}  // NOLINT
 
   bool operator==(NotificationType t) const { return value == t.value; }
   bool operator!=(NotificationType t) const { return value != t.value; }
 
   // Comparison to explicit enum values.
   bool operator==(Type v) const { return value == v; }
   bool operator!=(Type v) const { return value != v; }
 
   Type value;
 };
 
 inline bool operator==(NotificationType::Type a, NotificationType b) {
   return a == b.value;
 }
 inline bool operator!=(NotificationType::Type a, NotificationType b) {
   return a != b.value;
 }
 
 #endif  // CHROME_COMMON_NOTIFICATION_TYPE_H_