Clear DNS cache and passive log collected on incognito close.

chrome/test/data/webui/net_internals/net_internals_test.js

 // Copyright (c) 2011 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.
 
 /**
  * @fileoverview The way these tests work is as follows:
  * C++ in net_internals_ui_browsertest.cc does any necessary setup, and then
  * calls the entry point for a test with RunJavascriptTest.  The called
  * function can then use the assert/expect functions defined in test_api.js.
  * All callbacks from the browser are wrapped in such a way that they can
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     /**
      * Runs the function and then completes.
      */
     start: function() {
       this.taskFunction_();
       this.onTaskDone();
     }
   };
 
+  // Creates an incognito window.  May not be called if there already is an
+  // incognito in exitence.  Returns immediately.
+  function getCreateIncognitoBrowserTask() {
+    return new CallFunctionTask(
+        function() {
+          chrome.send('createIncognitoBrowser');
+        });
+  };
+
+  // Closes an incognito window created with the task above.  May only be
+  // called if there's an incognito window created by the above function
+  // that has yet to be closed.  Returns immediately.
+  function getCloseIncognitoBrowserTask() {
+    return new CallFunctionTask(
+        function() {
+          chrome.send('closeIncognitoBrowser');
+        });
+  };
+
   /**
    * Returns true if a node does not have a 'display' property of 'none'.
    * @param {node}: node The node to check.
    */
   function isDisplayed(node) {
     var style = getComputedStyle(node);
     return style.getPropertyValue('display') != 'none';
   }
 
   /**
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   return {
     test: test,
     checkStyledTableRows: checkStyledTableRows,
     checkTabHandleVisibility: checkTabHandleVisibility,
     getStyledTableText: getStyledTableText,
     isDisplayed: isDisplayed,
     runTest: runTest,
     switchToView: switchToView,
     TaskQueue: TaskQueue,
     Task: Task,
+    CallFunctionTask: CallFunctionTask,
+    getCreateIncognitoBrowserTask: getCreateIncognitoBrowserTask,
+    getCloseIncognitoBrowserTask: getCloseIncognitoBrowserTask,
     Source: Source,
     Event: Event,
     CreateBeginEvent: CreateBeginEvent,
     CreateEndEvent: CreateEndEvent,
     CreateMatchingEndEvent: CreateMatchingEndEvent
   };
 })();
 
 netInternalsTest.test('netInternalsDone', function() {
   testDone();
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   HostResolverInfoObserver.prototype.onHostResolverInfoChanged = function() {
     assertNotReached();
   };
 
   // Create the observer and add it to |g_browser|.
   g_browser.addHostResolverInfoObserver(new HostResolverInfoObserver());
 
   // Needed to trigger an update.
   netInternalsTest.switchToView('dns');
 });