Docserver: Add 'deprecated since' message for API nodes

chrome/common/extensions/docs/server2/api_data_source_test.py

 #!/usr/bin/env python
 # 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.
 
 import json
 import os
 import sys
 import unittest
 
@@ skipping 324 matching lines @@
         _FakeTemplateCache(),
         _FakeFeaturesBundle(),
         None).ToDict()
 
     # Test nodes that have the same availability as their parent.
     assertEquals('tabs.get', model_dict['functions'][1]['availability'])
     # Test nodes with varying availabilities.
     assertEquals('tabs.getCurrent',
                  model_dict['functions'][0]['availability']['version'])
 
+    # Test a node that became deprecated.
+    self.assertEquals({
+      'scheduled': None,
+      'version': 26,
+      'partial': 'handlebar chrome/common/extensions/docs/templates/' +
+          'private/intro_tables/deprecated_message.html'
+      }, model_dict['types'][2]['availability'])
 
 if __name__ == '__main__':
   unittest.main()