import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

js/xpconnect/tests/chrome/test_bug658560.xul

@@ -0,0 +1,39 @@
+<?xml version="1.0"?>
+<?xml-stylesheet href="chrome://global/skin" type="text/css"?>
+<?xml-stylesheet href="chrome://mochikit/content/tests/SimpleTest/test.css"
+                 type="text/css"?>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=658560
+-->
+<window title="Mozilla Bug 658560"
+  xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+  <script type="application/javascript"
+          src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+
+  <!-- test results are displayed in the html:body -->
+  <body xmlns="http://www.w3.org/1999/xhtml">
+  <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=658560"
+     target="_blank">Mozilla Bug 658560</a>
+  </body>
+
+  <!-- test code goes here -->
+  <script type="application/javascript"><![CDATA[
+
+      SimpleTest.waitForExplicitFinish();
+      function go() {
+        var win = $('ifr').contentWindow.wrappedJSObject;
+        let o = { prop: true };
+        win.foo = o;
+
+        is(win.foo, o, "should have === identity through a CrossOriginWrapper");
+        SimpleTest.finish();
+      }
+
+  ]]></script>
+
+  <iframe
+      src="http://example.org/tests/js/xpconnect/tests/mochitest/file_bug658560.html"
+          id="ifr"
+          type="content"
+          onload="go()" />
+</window>