DevTools: respect isUnderTest conditions in the browser tests.

third_party/WebKit/Source/devtools/front_end/host/InspectorFrontendHost.js

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 504 matching lines @@
   // so the host instance should not initialized there.
   initializeInspectorFrontendHost();
   window.InspectorFrontendAPI = new InspectorFrontendAPIImpl();
   Common.setLocalizationPlatform(InspectorFrontendHost.platform());
 })();
 
 /**
  * @type {!Common.EventTarget}
  */
 InspectorFrontendHost.events;
+
+/**
+ * @param {!Object<string, string>=} prefs
+ * @return {boolean}
+ */
+Host.isUnderTest = function(prefs) {
+  if (InspectorFrontendHost.isUnderTest())
+    return true;
+
+  if (prefs)
+    return prefs['isUnderTest'] === 'true';
+  return Common.settings.createSetting('isUnderTest', false).get();
+};