Disable deterministic Javascript for Swiffy benchmark pages

tools/perf/page_sets/tough_ad_cases.py

 # Copyright 2015 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.
 
 from telemetry.page import page as page_module
 from telemetry.page import page_set as page_set_module
 
 
 class SwiffyPage(page_module.Page):
 
   def __init__(self, url, page_set):
-    super(SwiffyPage, self).__init__(url=url, page_set=page_set)
+    super(SwiffyPage, self).__init__(url=url, page_set=page_set,
+                                     make_javascript_deterministic=False)
 
   def RunNavigateSteps(self, action_runner):
     super(SwiffyPage, self).RunNavigateSteps(action_runner)
     # Swiffy overwrites toString() to return a constant string, so "undo" that
     # here so that we don't think it has stomped over console.time.
     action_runner.EvaluateJavaScript(
         'Function.prototype.toString = function() { return "[native code]"; }')
     # Make sure we have a reasonable viewport for mobile.
     viewport_js = (
         'var meta = document.createElement("meta");'
@@ skipping 28 matching lines @@
         'shapes-CICAgMDO7cfIzwEQ1AMYPCgBMghqY8tqyRCArQ.swiffy72.html',
         'CICAgIDQ2Pb-MxCsAhj6ASgBMgi5DLoSO0gPbQ.swiffy72.html',
         'CICAgKCN39CopQEQoAEY2AQoATIID59gK5hjjIg.swiffy72.html',
         'CICAgKCNj4HgyAEQeBjYBCgBMgjQpPkOjyWNdw.1.swiffy72.html',
         'clip-paths-CILZhLqO_-27bxB4GNgEKAEyCC46kMLBXnMT.swiffy72.html',
         'CICAgMDOrcnRGRB4GNgEKAEyCP_ZBSfwUFsj.swiffy72.html',
     ]
     for page_name in swiffy_pages:
       url = base_url + '/' + page_name
       self.AddUserStory(SwiffyPage(url, self))