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+<p>This test verifies that garbage collection successfully cleans up after the destruction
+of a frame containing a JavaScript interpreter. If the test passes, you'll see a PASS message below.</p>
+<hr>
+<pre id="log"></pre>
+
+<!-- The test: -->
+<iframe id="iframe" src="data:text/html,<script>;</script>" style="display:none"></iframe>
+<script>
+function log(s)
+{
+    document.getElementById("log").appendChild(document.createTextNode(s));
+}
+
+var wiggleRoom = 20;
+
+window.onload = function main()
+{
+    if (!window.layoutTestController || !window.GCController) {
+        log("FAIL: This test uses the layoutTestController and the GCController, so it can only run in DumpRenderTree.\n");
+        return;
+    }
+    
+    layoutTestController.dumpAsText();
+    layoutTestController.waitUntilDone();
+
+    // Start with no garbage, so GC doesn't run automatically during the test.
+    GCController.collect();
+    
+    // Create a little garbage, so we can detect failure in the case where the 
+    // test doesn't produce any garbage because it fails to destroy the frame.
+    var garbage = [ { }, { }, { }, { }, { }, { }, { }, { }, { }, { } ];
+    garbage = null;
+
+    // Destroy a frame that has a JavaScript interpreter.
+    var iframe = document.getElementById("iframe");
+    iframe.parentNode.removeChild(iframe);
+
+    // Finish the test on a time-out, to allow the Frame keepAlive timer to fire
+    // and release the frame before we generate results.
+    var continueTest = function continueTest()
+    {
+        // Measure how many garbage JS objects are still around.
+        var jsObjectCountStart = GCController.getJSObjectCount();
+        GCController.collect();
+        var jsObjectCountDelta = jsObjectCountStart - GCController.getJSObjectCount();
+        var garbageCount = jsObjectCountDelta > 0 ? jsObjectCountDelta : 0;
+        
+        // Fail if a lot of garbage was left behind. This can mean one of many things:
+        // the frame was not destroyed; the frame destruction did not trigger GC; or
+        // GC was not effective.
+        if (garbageCount > wiggleRoom) {
+            log("FAIL: " + garbageCount + " garbage JS objects left uncollected.\n");
+        } else {
+            log("PASS: " + wiggleRoom + " garbage JS objects or fewer left uncollected after destroying a frame.\n");
+        }
+
+        layoutTestController.notifyDone();
+    }
+    setTimeout(continueTest, 10);
+}
+</script>