[DevTools] Prepare to pass modified InspectorFrontendHost to inspector app.

Source/devtools/front_end/devtools_app/UITests.js

+// Copyright 2014 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.
+
+if (window.domAutomationController) {
+    var uiTests = {};
+
+    uiTests.runTest = function(name)
+    {
+        if (uiTests._testSuite)
+            uiTests._testSuite._runTest(name);
+        else
+            uiTests._pendingTestName = name;
+    };
+
+    uiTests.testSuiteReady = function(testSuiteConstructor)
+    {
+        uiTests._testSuite = testSuiteConstructor(window.domAutomationController);
+        if (uiTests._pendingTestName) {
+            var name = uiTests._pendingTestName;
+            delete uiTests._pendingTestName;
+            uiTests._testSuite._runTest(name);
+        }
+    };
+}