[tests] Convert a detached typed array to a null string

third_party/WebKit/LayoutTests/fast/dom/Window/window-postmessage-args.html

Index: third_party/WebKit/LayoutTests/fast/dom/Window/window-postmessage-args.html
diff --git a/third_party/WebKit/LayoutTests/fast/dom/Window/window-postmessage-args.html b/third_party/WebKit/LayoutTests/fast/dom/Window/window-postmessage-args.html
index 7f2eeb862d6f04d195080454b4b5b4c2425f5aeb..ee07a6e0a54c1c6c8cee14e79d7f8146ff7793ae 100644
--- a/third_party/WebKit/LayoutTests/fast/dom/Window/window-postmessage-args.html
+++ b/third_party/WebKit/LayoutTests/fast/dom/Window/window-postmessage-args.html
@@ -25,6 +25,18 @@ function onmessage(evt) {
 
 window.addEventListener('message', onmessage, false);
 
+function convertDetached(obj) {
+    if (obj instanceof Int8Array && obj.byteLength === 0)
+        return "[detached TypedArray]";
+    return obj;
+}
+
+function convertArrayDetached(obj) {
+    if (obj instanceof Array)
+        return obj.map(convertDetached)
+    return obj;
+}
+
 function tryPostMessageFunction(postMessageFunction, first, second, third, shouldFail) {
     var pass, reason;
     try {
@@ -36,9 +48,9 @@ function tryPostMessageFunction(postMessageFunction, first, second, third, shoul
         reason = ": threw exception " + e;
     }
     if (pass)
-        testPassed("Posting message ('" + first + "', " + third + ")" + reason);
+        testPassed("Posting message ('" + convertDetached(first) + "', " + convertArrayDetached(third) + ")" + reason);
     else
-        testFailed("Posting message ('" + first + "', " + third + ")" + reason);
+        testFailed("Posting message ('" + convertDetached(first) + "', " + convertArrayDetached(third) + ")" + reason);
 }
 
 function tryPostMessage(first, second, third, shouldFail) {