sync: Move unique_client_tag hashing code

sync/sync.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     # The core sync library.
@@ skipping 669 matching lines @@
           'protocol/proto_value_conversions_unittest.cc',
           'sessions/ordered_commit_set_unittest.cc',
           'sessions/status_controller_unittest.cc',
           'sessions/sync_session_unittest.cc',
           'syncable/directory_backing_store_unittest.cc',
           'syncable/model_type_unittest.cc',
           'syncable/nigori_util_unittest.cc',
           'syncable/syncable_enum_conversions_unittest.cc',
           'syncable/syncable_id_unittest.cc',
           'syncable/syncable_unittest.cc',
+          'syncable/syncable_util_unittest.cc',
           'util/cryptographer_unittest.cc',
           'util/data_encryption_win_unittest.cc',
           'util/data_type_histogram_unittest.cc',
           'util/get_session_name_unittest.cc',
           'util/nigori_unittest.cc',
           'util/protobuf_unittest.cc',
         ],
         'conditions': [
           ['OS == "ios" and coverage != 0', {
             'sources!': [
@@ skipping 294 matching lines @@
           'variables': {
             'test_suite_name': 'sync_unit_tests',
             'input_shlib_path': '<(SHARED_LIB_DIR)/<(SHARED_LIB_PREFIX)sync_unit_tests<(SHARED_LIB_SUFFIX)',
           },
           'includes': [ '../build/apk_test.gypi' ],
         },
       ],
     }],
   ],
 }