Check for duplicate ArrayBuffer transferables.

LayoutTests/fast/canvas/webgl/script-tests/arraybuffer-transfer-of-control.js

Index: LayoutTests/fast/canvas/webgl/script-tests/arraybuffer-transfer-of-control.js
diff --git a/LayoutTests/fast/canvas/webgl/script-tests/arraybuffer-transfer-of-control.js b/LayoutTests/fast/canvas/webgl/script-tests/arraybuffer-transfer-of-control.js
index a2f3a1efd1772dde80be72461f0b3256ebfdddb8..4b1dd4637787451d3c9e7710d1c9f39cbbaae428 100644
--- a/LayoutTests/fast/canvas/webgl/script-tests/arraybuffer-transfer-of-control.js
+++ b/LayoutTests/fast/canvas/webgl/script-tests/arraybuffer-transfer-of-control.js
@@ -328,8 +328,10 @@ var testList = [{
 }, {
     name: "transfer list multiple",
     send: function(name) {
+        var buffer0 = createBuffer(arraySize);
+        wrapFailSend(name, { buffer : buffer0 }, [buffer0, buffer0]);
         var buffer = createBuffer(arraySize);
-        wrapSend(name, { buffer : buffer }, [buffer,buffer]);
+        wrapSend(name, { buffer : buffer }, [buffer]);
         assertBufferClosed(name, buffer);
         wrapFailSend(name, [buffer], [buffer]);
         wrapFailSend(name, [], [buffer]);