Profiler.is_supported takes browser_type instead of options.

tools/perf/measurements/loading_profile.py

 # Copyright 2013 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
 import tempfile
 
 from metrics import loading
 from telemetry.core import util
 from telemetry.core.platform.profiler import perf_profiler
 from telemetry.page import page_measurement
 
 class LoadingProfile(page_measurement.PageMeasurement):
   def __init__(self):
     super(LoadingProfile, self).__init__(discard_first_result=True)
 
-    if not perf_profiler.PerfProfiler.is_supported(None):
+    if not perf_profiler.PerfProfiler.is_supported(browser_type='any'):
       raise Exception('This measurement is not supported on this platform')
 
   @property
   def results_are_the_same_on_every_page(self):
     return False
 
   def AddCommandLineOptions(self, parser):
     # In order to change the default of an option, we must remove and re-add it.
     page_repeat_option = parser.get_option('--page-repeat')
     page_repeat_option.default = 2
@@ skipping 20 matching lines @@
     loading.LoadingMetric().AddResults(tab, results)
 
     profile_file = None
     for profile_file in profile_files:
       if 'renderer' in profile_file:
         break
 
     for function, period in perf_profiler.PerfProfiler.GetTopSamples(
         tab.browser.platform.GetOSName(), profile_file, 10).iteritems():
       results.Add(function.replace('.', '_'), 'period', period)