Check for duplicate ArrayBuffer transferables.

LayoutTests/fast/dom/Window/script-tests/postmessage-clone.js

 document.getElementById("description").innerHTML = "Tests that we clone object hierarchies";
 
 tryPostMessage('null');
 tryPostMessage('undefined');
 tryPostMessage('1');
 tryPostMessage('true');
 tryPostMessage('"1"');
 tryPostMessage('({})');
 tryPostMessage('({a:1})');
 tryPostMessage('({a:"a"})');
 tryPostMessage('({b:"a", a:"b"})');
 tryPostMessage('({p0:"string0", p1:"string1", p2:"string2", p3:"string3", p4:"string4", p5:"string5", p6:"string6", p7:"string7", p8:"string8", p9:"string9", p10:"string10", p11:"string11", p12:"string12", p13:"string13", p14:"string14", p15:"string15", p16:"string16", p17:"string17", p18:"string18", p19:"string19"})');
 tryPostMessage('({p0:"string1", p1:"string1", p2:"string2", p3:"string3", p4:"string4", p5:"string5", p6:"string6", p7:"string7", p8:"string8", p9:"string9", p10:"string10", p11:"string11", p12:"string12", p13:"string13", p14:"string14", p15:"string15", p16:"string16", p17:"string17", p18:"string18", p19:"string19"})');
 tryPostMessage('({a:""})');
 tryPostMessage('({a:0})');
 tryPostMessage('({a:1})');
 tryPostMessage('[]');
 tryPostMessage('["a", "a", "b", "a", "b"]');
 tryPostMessage('["a", "a", "b", {a:"b", b:"a"}]');
 tryPostMessage('[1,2,3]');
 tryPostMessage('[,,1]');
 tryPostMessage('(function(){})', true, null, DOMException.DATA_CLONE_ERR);
 tryPostMessage('var x = 0; try { eval("badref"); } catch(e) { x = e; } x', true, null, DOMException.DATA_CLONE_ERR);
 var arrayBuffer = new ArrayBuffer(1);
 tryPostMessage('"data"', false, null, 0, [arrayBuffer]);
 tryPostMessage('arrayBuffer', true, null, DOMException.DATA_CLONE_ERR);
+var duplicateArrayBuffer = new ArrayBuffer(1);
+tryPostMessage('"data"', true, null, DOMException.DATA_CLONE_ERR, [duplicateArrayBuffer, duplicateArrayBuffer]);
 var uint8Array = new Uint8Array([10]);
 tryPostMessage('"data"', false, null, 0, [uint8Array.buffer]);
 tryPostMessage('uint8Array', true, null, DOMException.DATA_CLONE_ERR);
 tryPostMessage('new Date(1234567890000)');
 tryPostMessage('new ConstructorWithPrototype("foo")', false, '({field:"foo"})');
 tryPostMessage('new Boolean(true)');
 tryPostMessage('new Boolean(false)');
 tryPostMessage('new String("gnirts")');
 tryPostMessage('new Number(42.0)');
 cyclicObject={};
@@ skipping 295 matching lines @@
             doPassFail(v[0].length === window.fileList.length, "FileList length sent correctly");
             doPassFail(v[0][0] !== v[1], "FileList should not respect reference equality (0)");
             doPassFail(v[0][1] !== v[2], "FileList should not respect reference equality (1)");
             doPassFail(v[0][0].name == window.file0.name, "FileList preserves order and data (name0)");
             doPassFail(v[0][1].name == window.file1.name, "FileList preserves order and data (name1)");
             doPassFail(equal(v[0][0].lastModifiedDate, window.file0.lastModifiedDate), "FileList preserves order and data (date0)");
             doPassFail(equal(v[0][1].lastModifiedDate, window.file1.lastModifiedDate), "FileList preserves order and data (date1)");
         });
 }
 tryPostMessage('"done"');