[Sync] Make SESSIONS an implicit type

net/tools/testserver/chromiumsync.py

 # 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.
 
 """An implementation of the server side of the Chromium sync protocol.
 
 The details of the protocol are described mostly by comments in the protocol
 buffer definition at chrome/browser/sync/protocol/sync.proto.
 """
 
@@ skipping 45 matching lines @@
     EXTENSIONS,
     HISTORY_DELETE_DIRECTIVE,
     NIGORI,
     PASSWORD,
     PREFERENCE,
     SEARCH_ENGINE,
     SESSION,
     SYNCED_NOTIFICATION,
     THEME,
     TYPED_URL,
-    EXTENSION_SETTINGS) = range(20)
+    EXTENSION_SETTINGS,
+    TAB,) = range(21)
 
 # An eumeration on the frequency at which the server should send errors
 # to the client. This would be specified by the url that triggers the error.
 # Note: This enum should be kept in the same order as the enum in sync_test.h.
 SYNC_ERROR_FREQUENCY = (
     ERROR_FREQUENCY_NONE,
     ERROR_FREQUENCY_ALWAYS,
     ERROR_FREQUENCY_TWO_THIRDS) = range(3)
 
 # Well-known server tag of the top level 'Google Chrome' folder.
@@ skipping 15 matching lines @@
     EXTENSIONS: SYNC_TYPE_FIELDS['extension'],
     HISTORY_DELETE_DIRECTIVE: SYNC_TYPE_FIELDS['history_delete_directive'],
     NIGORI: SYNC_TYPE_FIELDS['nigori'],
     PASSWORD: SYNC_TYPE_FIELDS['password'],
     PREFERENCE: SYNC_TYPE_FIELDS['preference'],
     SEARCH_ENGINE: SYNC_TYPE_FIELDS['search_engine'],
     SESSION: SYNC_TYPE_FIELDS['session'],
     SYNCED_NOTIFICATION: SYNC_TYPE_FIELDS["synced_notification"],
     THEME: SYNC_TYPE_FIELDS['theme'],
     TYPED_URL: SYNC_TYPE_FIELDS['typed_url'],
+    TAB: SYNC_TYPE_FIELDS['tab'],
     }
 
 # The parent ID used to indicate a top-level node.
 ROOT_ID = '0'
 
 # Unix time epoch in struct_time format. The tuple corresponds to UTC Wednesday
 # Jan 1 1970, 00:00:00, non-dst.
 UNIX_TIME_EPOCH = (1970, 1, 1, 0, 0, 0, 3, 1, 0)
 
 # The number of characters in the server-generated encryption key.
@@ skipping 1250 matching lines @@
     sending_nigori_node = False
     for entry in entries:
       if entry.name == 'Nigori':
         sending_nigori_node = True
       reply = update_response.entries.add()
       reply.CopyFrom(entry)
     update_sieve.SaveProgress(new_timestamp, update_response)
 
     if update_request.need_encryption_key or sending_nigori_node:
       update_response.encryption_keys.extend(self.account.GetKeystoreKeys())