| Index: third_party/WebKit/LayoutTests/security/immutable-prototype-worker.html
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| diff --git a/third_party/WebKit/LayoutTests/security/immutable-prototype-worker.html b/third_party/WebKit/LayoutTests/security/immutable-prototype-worker.html
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| new file mode 100644
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| index 0000000000000000000000000000000000000000..6c4a42341bb15384f819c8e43785ca700c5f1d83
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| --- /dev/null
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| +++ b/third_party/WebKit/LayoutTests/security/immutable-prototype-worker.html
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| @@ -0,0 +1,17 @@
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| +<!DOCTYPE html>
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| +<html>
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| +<script src="../resources/testharness.js"></script>
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| +<script src="../resources/testharnessreport.js"></script>
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| +<script>
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| +'use strict';
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| +
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| +let expected = ['immutable', 'immutable', 'immutable', 'immutable', 'immutable'];
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| +
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| +async_test(function(t) {
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| +  let worker = new Worker('immutable-prototype-worker.js');
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| +  worker.onmessage = t.step_func_done(function(result) {
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| +    assert_array_equals(expected, result.data);
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| +  });
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| +}, 'worker prototype chain should be immutable');
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| +</script>
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| +</html>
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| 
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