Extend message for sync presubmit

components/sync/PRESUBMIT.py

 # Copyright (c) 2016 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.
 
 """Presubmit script for sync
 This checks that ModelTypeInfo entries in model_type.cc follow conventions.
 See CheckModelTypeInfoMap or model_type.cc for more detail on the rules.
 """
 
 import os
@@ skipping 243 matching lines @@
     A potentially empty list of PresubmitError objects corresponding to
     violations of the above rule
   """
   if map_entry.field_number == '-1':
     return []
   proto_message_name = proto_field_definitions[
     FieldNumberToPrototypeString(map_entry.field_number)]
   if map_entry.notification_type.lower() != proto_message_name:
     return [
       FormatPresubmitError(
-        output_api,'notification type "%s" does not match proto message'
+        output_api,'In the construction of ModelTypeInfo: notification type'
+        ' "%s" does not match proto message'
         ' name defined in sync.proto: ' '"%s"' %
         (map_entry.notification_type, proto_message_name),
         map_entry.affected_lines)]
   return []
 
 
 def CheckNoDuplicatedFieldValues(output_api, map_entries):
   """Check that map_entries has no duplicated field values.
   Verifies that every map_entry in map_entries doesn't have a field value
   used elsewhere in map_entries, ignoring special values ("" and -1).
@@ skipping 75 matching lines @@
   Args:
     field_number: string representation of a field number enum reference
   Returns:
     A string that is the corresponding proto field data type. e.g.
     FieldNumberToPrototypeString('EntitySpecifics::kAppFieldNumber')
     => 'AppSpecifics'
   """
   return field_number.replace(FIELD_NUMBER_PREFIX, '').replace(
     'FieldNumber', 'Specifics').replace(
     'AppNotificationSpecifics', 'AppNotification')