Add isolate/swarming support for some Blink test targets.

Source/wtf/wtf_tests.gyp

 # Copyright (C) 2013 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 77 matching lines @@
           '<(DEPTH)/base/base.gyp:base_java',
           '<(DEPTH)/net/net.gyp:net_java',
           'wtf_unittests',
         ],
         'variables': {
           'test_suite_name': 'wtf_unittests',
         },
         'includes': [ '../../../../build/apk_test.gypi' ],
       }],
     }],
+    ['test_isolation_mode != "noop"', {
+      'targets': [
+        {
+          'target_name': 'wtf_unittests_run',
+          'type': 'none',
+          'dependencies': [
+            'wtf_unittests',
+          ],
+          'includes': [
+            '../../../../build/isolate.gypi',
+          ],
+          'sources': [
+            'wtf_unittests.isolate',
+          ],
+        },
+      ],
+    }],
   ],
 }