Adding a test for measuring memory usage.

tools/telemetry/telemetry/inspector_page_unittest.py

 # Copyright (c) 2012 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.
 import os
 
 from telemetry import tab_test_case
 
 class InspectorPageTest(tab_test_case.TabTestCase):
   def __init__(self, *args):
     super(InspectorPageTest, self).__init__(*args)
-    self._custom_action_called = False
 
   def testPageNavigateToNormalUrl(self):
     self._tab.page.Navigate('http://www.google.com')
     self._tab.WaitForDocumentReadyStateToBeComplete()
 
   def testPageNavigateToUrlChanger(self):
     # The Url that we actually load is http://www.youtube.com/.
     self._tab.page.Navigate('http://youtube.com/')
 
     self._tab.WaitForDocumentReadyStateToBeComplete()
 
   def testPageNavigateToImpossibleURL(self):
     self._tab.page.Navigate('http://23f09f0f9fsdflajsfaldfkj2f3f.com')
     self._tab.WaitForDocumentReadyStateToBeComplete()
 
   def testCustomActionToNavigate(self):
     unittest_data_dir = os.path.join(os.path.dirname(__file__),
                                      '..', 'unittest_data')
     self._browser.SetHTTPServerDirectory(unittest_data_dir)
     self._tab.page.Navigate(
       self._browser.http_server.UrlOf('page_with_link.html'))
     self._tab.WaitForDocumentReadyStateToBeComplete()
     self.assertEquals(self._tab.runtime.Evaluate('document.location.pathname;'),
                       '/page_with_link.html')
 
-    self._custom_action_called = False
+    custom_action_called = [False]
     def CustomAction():
-      self._custom_action_called = True
+      custom_action_called[0] = True
       self._tab.runtime.Execute('document.getElementById("clickme").click();')
 
     self._tab.page.PerformActionAndWaitForNavigate(CustomAction)
 
-    self.assertTrue(self._custom_action_called)
+    self.assertTrue(custom_action_called[0])
     self.assertEquals(self._tab.runtime.Evaluate('document.location.pathname;'),
                       '/blank.html')