Finish deflaking the net-internals prerender view test and split it in two.

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
  * also use the assert/expect functions.
  *
  * A test ends when an assert/expect test fails, an exception is thrown, or
  * |netInternalsTest.testDone| is called.  At that point, or soon afterwards,
  * the title is updated to 'Test Failed' if an assert/expect test fails, or
  * there was an exception.  Otherwise, it's set to 'Test Passed'.  The
  * behavior when an assert/expect test fails or an assertion is thrown only
  * after |netInternalsTest.testDone| is called is undefined.
  */
 
 // Start of namespace.
 var netInternalsTest = (function() {
   /**
-   * Use a shorter poll interval for tests, since a few tests wait for polled
-   * values to change.
+   * A shorter poll interval is used for tests, since a few tests wait for
+   * polled values to change.
    * @type {number}
    * @const
    */
   var TESTING_POLL_INTERVAL_MS = 50;
 
   /**
    * Indicates if the test is complete.
    * @type {boolean}
    */
   var done = false;
@@ skipping 118 matching lines @@
    * @param {string} testName The of the test to run.
    * @param {Function} testArguments The test arguments.
    */
   function startNetInternalsTest(testName, testArguments) {
     // Wrap g_browser.receive around a test function so that assert and expect
     // functions can be called from observers.
     g_browser.receive = createTestFunction('g_browser.receive', function() {
       BrowserBridge.prototype.receive.apply(g_browser, arguments);
     });
 
+    g_browser.setPollInterval(TESTING_POLL_INTERVAL_MS);
     createTestFunction(testName, tests[testName]).apply(null, testArguments);
   }
 
   /**
    * Finds the first styled table that's a child of |parentId|, and returns the
    * number of rows it has.  Returns -1 if there's no such table.
    * @param {string} parentId HTML element id containing a styled table.
    * @return {number} Number of rows the style table's body has.
    */
   function getStyledTableNumRows(parentId) {
@@ skipping 97 matching lines @@
   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');
 });