First step in switching to testRunner instead of layoutTestController.

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();
 }
 
+var testRunner = window.testRunner || window.layoutTestController;
+
 function processMessage(msg) {
-  if (window.layoutTestController) {
+  if (testRunner) {
     if (msg == 'unittest-suite-done') {
-      window.layoutTestController.notifyDone();
+      testRunner.notifyDone();
     } else if (msg == 'unittest-suite-wait-for-done') {
-      window.layoutTestController.startedDartTest = true;
+      testRunner.startedDartTest = true;
     }
   }
 }
 
 function onReceive(e) {
   processMessage(e.data);
 }
 
-if (window.layoutTestController) {
-  window.layoutTestController.dumpAsText();
-  window.layoutTestController.waitUntilDone();
+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);
   }
-  if (window.layoutTestController) {
-    window.layoutTestController.notifyDone();
+  if (testRunner) {
+    testRunner.notifyDone();
   }
 }
 
 function onLoad(e) {
   // needed for dartium compilation errors.
   if (window.compilationError) {
     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();
+      if (testRunner && !testRunner.startedDartTest) {
+        testRunner.notifyDone();
       }
     }, 0);
   }, 50);
 };