Add isolate/swarming support for webkit_unit_tests.

Source/web/web_tests.gyp

 #
 # Copyright (C) 2011 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
@@ skipping 156 matching lines @@
                         'inputs': [
                           '<(PRODUCT_DIR)/natives_blob.bin',
                           '<(PRODUCT_DIR)/snapshot_blob.bin',
                         ],
                       }],
                     ],
                 },
                 'includes': [ '../../../../build/apk_test.gypi' ],
             }],
         }],
+        ['test_isolation_mode != "noop"', {
+            'targets': [
+                {
+                    'target_name': 'webkit_unit_tests_run',
+                    'type': 'none',
+                    'dependencies': [
+                        'webkit_unit_tests',
+                    ],
+                    'includes': [
+                        '../../../../build/isolate.gypi',
+                    ],
+                    'sources': [
+                        'webkit_unit_tests.isolate',
+                    ],
+                },
+            ],
+        }],
     ],
 }