Run dart2js tests unmodified in browser.

dart/pkg/unittest/test_controller.js

Index: dart/pkg/unittest/test_controller.js
diff --git a/dart/pkg/unittest/test_controller.js b/dart/pkg/unittest/test_controller.js
index ce7a8f0d469ee10bf7536939d94ac0f251a8dd78..0be04fbae10f41cedaaf7e8ddce2e8fe6a5abd1e 100644
--- a/dart/pkg/unittest/test_controller.js
+++ b/dart/pkg/unittest/test_controller.js
@@ -75,3 +75,19 @@ document.onreadystatechange = function() {
     }, 0);
   }, 50);
 };
+
+function dartMainRunner(main) {
+  var caughtError;
+  function handleError(e) { caughtError = e; }
+
+  window.postMessage('unittest-suite-wait-for-done', '*');
+  window.addEventListener('error', handleError, false);
+  main();

[kasperl, 2012/09/06 10:29:29]

We have had issues with uncaught JavaScript exceptions falling out of main which
leads to tests that time out. Maybe this would be a great time to wrap the
main() call in try-catch?

[ahe, 2012/09/08 13:32:32]

I think that is handled by 'window.addEventListener("error",...' above.

+  window.removeEventListener('error', handleError, false);
+  if (typeof caughtError != 'undefined') {
+    document.body.innerHTML = String(caughtError);
+  } else {
+    document.body.innerHTML = "PASS";
+  }
+  window.postMessage('unittest-suite-done', '*');
+}