Update isolate file for sync_integration_tests and enable swarming for it.

build/all.gyp

 # 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.
 
 {
   'variables': {
     # A hook that can be overridden in other repositories to add additional
     # compilation targets to 'All'. Only used on Android.
     'android_app_targets%': [],
   },
@@ skipping 1243 matching lines @@
     }], # "use_aura==1"
     ['test_isolation_mode != "noop"', {
       'targets': [
         {
           'target_name': 'chromium_swarm_tests',
           'type': 'none',
           'dependencies': [
             '../base/base.gyp:base_unittests_run',
             '../chrome/chrome.gyp:browser_tests_run',
             '../chrome/chrome.gyp:interactive_ui_tests_run',
-            # http://crbug.com/157234
-            #'../chrome/chrome.gyp:sync_integration_tests_run',
+            '../chrome/chrome.gyp:sync_integration_tests_run',
             '../chrome/chrome.gyp:unit_tests_run',
             '../content/content_shell_and_tests.gyp:content_browsertests_run',
             '../content/content_shell_and_tests.gyp:content_unittests_run',
             '../net/net.gyp:net_unittests_run',
           ],
         }, # target_name: chromium_swarm_tests
       ],
     }],
     ['OS=="mac" and toolkit_views==1', {
       'targets': [
         {
           'target_name': 'macviews_builder',
           'type': 'none',
           'dependencies': [
             '../ui/views/examples/examples.gyp:views_examples_with_content_exe',
             '../ui/views/views.gyp:views',
             '../ui/views/views.gyp:views_unittests',
           ],
         },  # target_name: macviews_builder
       ],  # targets
     }],  # os=='mac' and toolkit_views==1
   ],  # conditions
 }