Enable wrapper-less browser tests on selenium.

dart/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;
 
 function processMessage(msg) {
   if (typeof msg != 'string') 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', '*');
     }
   } else if (msg == 'unittest-suite-success') {
-    document.body.innerHTML += '<pre>PASS</pre>';
+    dartPrint('PASS');
     if (testRunner) testRunner.notifyDone();
   } else if (msg == 'unittest-suite-fail') {
     showErrorAndExit('Some tests failed.');
   }
 }
 
 function onReceive(e) {
   processMessage(e.data);
 }
 
 if (testRunner) {
   testRunner.dumpAsText();
   testRunner.waitUntilDone();
 }
 window.addEventListener("message", onReceive, false);
 
 function showErrorAndExit(message) {
   if (message) {
-    var element = document.createElement('pre');
-    element.innerHTML = message;
-    document.body.appendChild(element);
+    dartPrint('Error: ' + String(message));
   }
-  if (testRunner) {
-    testRunner.notifyDone();
-  }
+  // dart/tools/testing/run_selenium.py is looking for either PASS or
+  // FAIL and will continue polling until one of these words show up.
+  dartPrint('FAIL');
+  if (testRunner) testRunner.notifyDone();
 }
 
 function onLoad(e) {
   // needed for dartium compilation errors.
   if (window.compilationError) {
     showErrorAndExit(window.compilationError);
   }
 }
 
 window.addEventListener("DOMContentLoaded", onLoad, false);
@@ skipping 34 matching lines @@
   }
   var pre = document.createElement("pre");
   pre.appendChild(document.createTextNode(String(msg)));
   document.body.appendChild(pre);
 }
 
 // dart2js will generate code to call this function instead of calling
 // Dart [main] directly. The argument is a closure that invokes main.
 function dartMainRunner(main) {
   window.postMessage('dart-calling-main', '*');
-  main();
+  try {
+    main();
+  } catch (e) {
+    window.postMessage('unittest-suite-fail', '*');
+    return;
+  }
   window.postMessage('dart-main-done', '*');
 }