DevTools: improve test infrastructure w/ devtools driving the test

third_party/WebKit/Source/devtools/front_end/shell/TestShell.js

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 Shell.TestShell = class {
   /**
    * @suppressGlobalPropertiesCheck
    */
   constructor() {
     runOnWindowLoad(this.initializeUnitTest.bind(this));
@@ skipping 16 matching lines @@
 
     UI.zoomManager = new UI.ZoomManager(self, InspectorFrontendHost);
     UI.inspectorView = UI.InspectorView.instance();
     UI.ContextMenu.initialize();
     UI.ContextMenu.installHandler(document);
     UI.Tooltip.installHandler(document);
 
     var rootView = new UI.RootView();
     UI.inspectorView.show(rootView.element);
     rootView.attachToDocument(document);
-    TestRunner.executeTestScript();
+    TestRunner.start();
   }
 };
 
 new Shell.TestShell();