Create a fresh sync datatype for Synced Notifications

sync/internal_api/public/base/model_type.h

 // Copyright 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.
 
 // Enumerate the various item subtypes that are supported by sync.
 // Each sync object is expected to have an immutable object type.
 // An object's type is inferred from the type of data it holds.
 
 #ifndef SYNC_INTERNAL_API_PUBLIC_BASE_MODEL_TYPE_H_
 #define SYNC_INTERNAL_API_PUBLIC_BASE_MODEL_TYPE_H_
@@ skipping 65 matching lines @@
   // An app folder or an app object.
   APPS,
   // An app setting from the extension settings API.
   APP_SETTINGS,
   // An extension setting from the extension settings API.
   EXTENSION_SETTINGS,
   // App notifications.
   APP_NOTIFICATIONS,
   // History delete directives.
   HISTORY_DELETE_DIRECTIVES,
-  LAST_USER_MODEL_TYPE = HISTORY_DELETE_DIRECTIVES,
+  // Synced push notifications.
+  SYNCED_NOTIFICATIONS,
+  LAST_USER_MODEL_TYPE = SYNCED_NOTIFICATIONS,
 
   // An object representing a set of Nigori keys.
   NIGORI,
   FIRST_CONTROL_MODEL_TYPE = NIGORI,
   // Client-specific metadata.
   DEVICE_INFO,
   // Flags to enable experimental features.
   EXPERIMENTS,
   LAST_CONTROL_MODEL_TYPE = EXPERIMENTS,
 
@@ skipping 135 matching lines @@
 // type and |model_type| was filled in.
 bool NotificationTypeToRealModelType(const std::string& notification_type,
                                      ModelType* model_type);
 
 // Returns true if |model_type| is a real datatype
 SYNC_EXPORT bool IsRealDataType(ModelType model_type);
 
 }  // namespace syncer
 
 #endif  // SYNC_INTERNAL_API_PUBLIC_BASE_MODEL_TYPE_H_