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

pkg/unittest/test_controller.js

 // Copyright (c) 2011, 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.
 
 /**
  * Test controller logic - used by unit test harness to embed tests in
  * DumpRenderTree.
  */
 
 if (navigator.webkitStartDart) {
   navigator.webkitStartDart();
 }
 
 // testRunner is provided by DRT or WebKit's layout tests.
 // It is not available in selenium tests.
 var testRunner = window.testRunner || window.layoutTestController;
 
 var waitForDone = false;
 
+// _callback and getMessages are used to retrieve console messages
+// from the Chrome ConsoleCollector extension. run_selenium.py can
+// call getMessages with execute_async_script, and when the messages
+// are returned from the extension they can be returned via a callback
+// provided by Selenium. _callback is used to hold a reference to 
+// that callback. The messages are returned from the extension via
+// a window.postMessage call with type property 'gotMessages'.
+var _callback;
+function getMessages(callback) {
+  _callback = callback;
+  window.postMessage("getMessages", "*");
+}
+
 function processMessage(msg) {
-  if (typeof msg != 'string') return;
+  if (typeof msg != 'string') {
+    if (msg.type == 'gotMessages') {
+      // Handle console messages from Chrome extension.
+      if (_callback) {
+        _callback(msg.messages);
+        _callback = null;
+      }
+    }
+    return;
+  }
   if (msg == 'unittest-suite-done') {
     if (testRunner) testRunner.notifyDone();
   } else if (msg == 'unittest-suite-wait-for-done') {
     waitForDone = true;
     if (testRunner) testRunner.startedDartTest = true;
   } else if (msg == 'dart-calling-main') {
     if (testRunner) testRunner.startedDartTest = true;
   } else if (msg == 'dart-main-done') {
     if (!waitForDone) {
       window.postMessage('unittest-suite-success', '*');
@@ skipping 80 matching lines @@
 function dartMainRunner(main) {
   window.postMessage('dart-calling-main', '*');
   try {
     main();
   } catch (e) {
     window.postMessage('unittest-suite-fail', '*');
     return;
   }
   window.postMessage('dart-main-done', '*');
 }