Listen for on.error events in test_controller.js

lib/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) {
@@ skipping 13 matching lines @@
 function onReceive(e) {
   processMessage(e.data);
 }
 
 if (window.layoutTestController) {
   window.layoutTestController.dumpAsText();
   window.layoutTestController.waitUntilDone();
 }
 window.addEventListener("message", onReceive, false);
 
+function showErrorAndExit(message) {
+  if (message) {
+    var element = document.createElement('pre');
+    element.innerHTML = message;
+    document.body.appendChild(element);
+  }
+  if (window.layoutTestController) {
+    window.layoutTestController.notifyDone();
+  }
+}
+
 function onLoad(e) {
   // needed for dartium compilation errors.
   if (window.compilationError) {
-    var element = document.createElement('pre');
-    element.innerHTML = window.compilationError;
-    document.body.appendChild(element);
-    window.layoutTestController.notifyDone();
-    return;
+    showErrorAndExit(window.compilationError);
   }
 }
 
 window.addEventListener("DOMContentLoaded", onLoad, false);
+
+// If nobody intercepts the error, finish the test.
+window.addEventListener("error", function(e) {
+  // needed for dartium compilation errors.
+  showErrorAndExit(e && e.message);
+}, false);
+
+document.onreadystatechange = function() {
+  if (document.readyState != "loaded") return;
+  // If 'startedDartTest' is not set, that means that the test did not have
+  // a chance to load. This will happen when a load error occurs in the VM.
+  // Give the machine time to start up.
+  setTimeout(function() {
+    // A window.postMessage might have been enqueued after this timeout.
+    // Just sleep another time to give the browser the time to process the
+    // posted message.
+    setTimeout(function() {
+      if (layoutTestController && !layoutTestController.startedDartTest) {
+        layoutTestController.notifyDone();
+      }
+    }, 0);
+  }, 50);
+};