Allow temporary file system for incognito DevTools.

third_party/WebKit/Source/devtools/front_end/Tests.js

 /*
  * Copyright (C) 2010 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 853 matching lines @@
       test.assertEquals('Simple content script', values[1]);
       test.releaseControl();
     }
   };
 
   TestSuite.prototype.testDevToolsSharedWorker = function() {
     this.takeControl();
     Bindings.TempFile.ensureTempStorageCleared().then(() => this.releaseControl());
   };
 
+  TestSuite.prototype.testTempFile = function() {
+    this.takeControl();
+    Bindings.TempFile.create('test-file', 'test')
+        .then(() => this.releaseControl(), (error) => this.fail(String(error)));
+  };
+
   TestSuite.prototype.waitForTestResultsInConsole = function() {
     var messages = SDK.multitargetConsoleModel.messages();
     for (var i = 0; i < messages.length; ++i) {
       var text = messages[i].messageText;
       if (text === 'PASS')
         return;
       else if (/^FAIL/.test(text))
         this.fail(text);  // This will throw.
     }
     // Neither PASS nor FAIL, so wait for more messages.
@@ skipping 220 matching lines @@
       if (runtimeModel.executionContexts().length >= n)
         callback.call(null);
       else
         this.addSniffer(SDK.RuntimeModel.prototype, '_executionContextCreated', checkForExecutionContexts.bind(this));
     }
   };
 
 
   window.uiTests = new TestSuite(window.domAutomationController);
 })(window);