Chrome extension to get console messages upon test failures. Unlike the

tools/testing/extensions/chrome/ConsoleCollector/content.js

+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// This is the content page script. This runs in the context of the browser
+// page, and communicates with the background page by relaying an getMessages
+// request, and the forwarding the messages back to the browser page as a
+// gotMessages message.
+window.addEventListener("message", function(event) {
+  if (event.source == window && event.data == "getMessages") {
+    chrome.extension.sendRequest({command: "getMessages"}, function(messages) {
+      window.postMessage({ "type": "gotMessages", "messages" : messages}, "*");
+    });
+  }
+}, false);
+