Add additional test harness error handling to test_controller.

pkg/unittest/test_controller.js

Index: pkg/unittest/test_controller.js
===================================================================
--- pkg/unittest/test_controller.js	(revision 14244)
+++ pkg/unittest/test_controller.js	(working copy)
@@ -7,6 +7,18 @@
  * DumpRenderTree.
  */
 
+// Clear the console before every test run.
+if (typeof console == "object" && typeof console.clear == "function") {
+  console.clear();

[ahe, 2012/10/30 09:48:51]

Unfortunately, I only think this works in Firebug. But it is worth a try.

+}
+
+// Set window onerror to make sure that we catch test harness errors across all
+// browsers.
+window.onerror = function (message, url, lineNumber) {
+  showErrorAndExit("\n\n" + url + ":" + lineNumber + ":\n" + message + "\n\n");
+  window.postMessage('unittest-suite-external-error', '*');
+};
+
 if (navigator.webkitStartDart) {
   navigator.webkitStartDart();
 }