BrowserOptions.extra_browser_args is now a set.

tools/perf/measurements/startup.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 json
 
 from telemetry.page import page_measurement
 
 class Startup(page_measurement.PageMeasurement):
   """Performs a measurement of Chromium's startup performance.
@@ skipping 22 matching lines @@
   def CustomizeBrowserOptions(self, options):
     # TODO: Once the bots start running benchmarks, enforce that either --warm
     # or --cold is explicitly specified.
     # assert options.warm != options.cold, \
     #     "You must specify either --warm or --cold"
     if options.cold:
       options.clear_sytem_cache_for_browser_and_profile_on_start = True
     else:
       self.discard_first_result = True
 
-    options.AppendExtraBrowserArg('--enable-stats-collection-bindings')
+    options.AppendExtraBrowserArgs([
+        '--enable-stats-collection-bindings',
 
-    # Old commandline flags used for reference builds.
-    options.AppendExtraBrowserArg('--dom-automation')
-    options.AppendExtraBrowserArg(
-          '--reduce-security-for-dom-automation-tests')
+        # Old commandline flags used for reference builds.
+        '--dom-automation',
+        '--reduce-security-for-dom-automation-tests'
+    ])
 
   def MeasurePage(self, page, tab, results):
     # TODO(jeremy): Remove references to
     # domAutomationController.getBrowserHistogram when we update the reference
     # builds.
     get_histogram_js = ('(window.statsCollectionController ?'
         'statsCollectionController :'
         'domAutomationController).getBrowserHistogram("%s")')
 
     for display_name, histogram_name in self.HISTOGRAMS_TO_RECORD.iteritems():
       result = tab.EvaluateJavaScript(get_histogram_js % histogram_name)
       result = json.loads(result)
       measured_time = 0
 
       if 'sum' in result:
         # For all the histograms logged here, there's a single entry so sum
         # is the exact value for that entry.
         measured_time = result['sum']
       elif 'buckets' in result:
         measured_time = \
             (result['buckets'][0]['high'] + result['buckets'][0]['low']) / 2
 
       results.Add(display_name, 'ms', measured_time)