[Telemetry] Cause web server to keep resources in memory and thread requests.

tools/telemetry/telemetry/core/chrome/tracing_backend_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 cStringIO
 import json
 import logging
 import os
 import unittest
 
 from telemetry.core import util
 from telemetry.core.chrome import tracing_backend
 from telemetry.test import tab_test_case
 
 
 class TracingBackendTest(tab_test_case.TabTestCase):
   def _StartServer(self):
     base_dir = os.path.dirname(__file__)
-    self._browser.SetHTTPServerDirectory(
+    self._browser.SetHTTPServerDirectories(
         os.path.join(base_dir, '..', '..', '..', 'unittest_data'))
 
   def _WaitForAnimationFrame(self):
     def _IsDone():
       js_is_done = """done"""
       return bool(self._tab.EvaluateJavaScript(js_is_done))
     util.WaitFor(_IsDone, 5)
 
   def testGotTrace(self):
     if not self._browser.supports_tracing:
@@ skipping 35 matching lines @@
         '"bar"',
         '"baz"'])
     f = cStringIO.StringIO()
     ri.Serialize(f)
     v = f.getvalue()
 
     j = json.loads(v)
     assert 'traceEvents' in j
     self.assertEquals(j['traceEvents'],
                       ['foo', 'bar', 'baz'])